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Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle - Education - Nairaland

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Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by YungMillionaire: 8:39pm On May 01, 2017
As someone who is a big fan of pure reasoning and logic, I have decided that once a year I will offer 10 000 naira to any Nairalander who is able to solve a unique math problem. The goal is to appreciate people who show a unique ability for clear thinking and originality. This year the award will go to the first Nlander to solve this problem:
A farmer has a small farm of chickens and rabbits. There are 28 heads in total and 80 legs in total. By using simple logic and reasoning find out how many chickens he has and how many rabbits he has. You have to SHOW YOUR WORK. IT IS NOT ENOUGH TO GET THE RIGHT ANSWER, YOU HAVE TO SHOW HOW (WITHOUT USING FORMAL MATHEMATICS – YOU CAN HOWEVER USE FORMAL MATH TO SHOW THAT YOUR REASONING IS CORRECT) YOU SOLVE IT USING PURE REASONING AND LOGIC. IF YOU SOLVE IT USING FORMAL MATHETICS YOU WILL NOT GET THE PRIZE AWARD. IF YOU ARE THE FIRST TO SOLVE THIS PROBLEM IN THE MANNER DESCRIBED ALL YOU HAVE TO DO IS PM ME YOUR BANK DETAILS AND YOU GET YOUR 10,000 NAIRA.

Good luck.
YungMill

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by AkinPhysicist: 8:40pm On May 01, 2017
cool

Solution
Using simple logic: Imagine the animals all raise one leg. When this is done, there will be a total of 80 – 28 = 52 legs visible. Then imagine each of the animals raising a second leg, then there will be 52 – 28 = 24 legs left. Since the chickens have only two legs, all the 24 legs must belong to the rabbits. Now since the rabbits have already raised two legs, then each of the rabbits must be contributing 2 legs to the 24. Therefore there are 24 divided 2 = 12 rabbits. Therefore, since there are 28 animals in total, then there are 28 – 12 = 16 chickens.

Format mathematics method:
Let X be the number of Chickens and Y be the number of Rabbits. Here is the formal mathematical approach.
X + Y = 28 (1)
2X + 4Y = 80 (2)

Multiply eq.1 by 4:
4X + 4Y = 112 (3)
Subtract eq.2 from eq. 3:
2X = 112 – 80 => 2X = 32 => X = 16 therefore Y = 28 – 16 = 12.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by AkinPhysicist: 8:40pm On May 01, 2017
shocked Yungi this is easy stuff now - I have already solved it. grin

YungMillionaire:
I see AK in the building grin

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by AkinPhysicist: 8:40pm On May 01, 2017
cheesy Ibos (sorry Ipobs) are not happy that I am claiming this money. Anyway, I really don't need it. YungMill please give the prize money to charity. Preferably a university student (a non-cultist) working very hard and within 2nd class upper/1st class range. Or whatever classification you guys are currently using in 9ja. The student tribe is irrelevant but the University must be a SouthWest university. Please, I don't want my prize money to go to any Biafran Republic or Boko Haram university. grin


YungMill lets talk tomorrow. I am out 2 go play ball with the guys.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by YungMillionaire: 8:41pm On May 01, 2017
It is very possible that Akin saw my 1st attempt to post this thread which was deleted somehow. This 2nd attempt was submitted 2 minutes after the 1st attempt. Which means it took akin no more than 3 mins to solve the problem.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by dingbang(m): 8:42pm On May 01, 2017
Yorex2011
Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by smartty68(m): 8:42pm On May 01, 2017
This one that involve maths, just watch how maths haters would react grin

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by YungMillionaire: 8:45pm On May 01, 2017
AkinPhysicist:
cool

Solution
Using simple logic: Imagine the animals all raise one leg. When this is done, there will be a total of 80 – 28 = 52 legs visible. Then imagine each of the animals raising a second leg, then there will be 52 – 28 = 24 legs left. Since the chickens have only two legs, all the 24 legs must belong to the rabbits. Now since the rabbits have already raised two legs, then each of the rabbits must be contributing 2 legs to the 24. Therefore there are 24 divided 2 = 12 rabbits. Therefore, since there are 28 animals in total, then there are 28 – 12 = 16 chickens.

Format mathematics method:
Let X be the number of Chickens and Y be the number of Rabbits. Here is the formal mathematical approach.
X + Y = 28 (1)
2X + 4Y = 80 (2)

Multiply eq.1 by 4:
4X + 4Y = 112 (3)
Subtract eq.2 from eq. 3:
2X = 112 – 80 => 2X = 32 => X = 16 therefore Y = 28 – 16 = 12.

AKIN you are fvcking wizard WOW FUCKING WOW!!!

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by pearlistar: 8:45pm On May 01, 2017
AkinPhysicist:
cheesy

Please I need home tutorial on Sage 50 accounting package in Lagos. Send a mail to pearlcherry5@gmail.com

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by YungMillionaire: 8:46pm On May 01, 2017
Akin if you really want me to give it to charity I will respect your wishes. However, next time PLEASE I think you should exempt yourself from future competitions. Your brain is too hot. grin

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by YungMillionaire: 8:46pm On May 01, 2017
shocked

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by dingbang(m): 8:46pm On May 01, 2017
Na only u post am .. Only u come solve am..

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by dchem(m): 8:48pm On May 01, 2017
Its simple. 28 of 2 leg is 56 remaing 24 legs which could be used by only 12 rabbit. So we have 12 rabbit and 16 chicken. There you go without formal mathematics.
Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by GodIsBiafran: 8:48pm On May 01, 2017
cool If only this akin guy can use his intelligence for something positive rather than anti-Igbo bigotry, this world will be a better place. Anyway, he won the prize no yawa. Congrats.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by GodIsBiafran: 8:49pm On May 01, 2017
Akin you might be a very smart guy but you are still a bigot. STOP your anti-Igbo rantings and maybe we will start taking you seriously.

10 Likes

Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by GodIsBiafran: 8:49pm On May 01, 2017
angry
Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by lytech1(m): 8:50pm On May 01, 2017
Will be solving this using simultaneous equation .
Lets represent rabbit with X

lets represent hen with Y

solution:
X+Y=28(2 ) ......equation I
4X+2Y=80(1) ......equation II
2X+2Y=56.....equation III
4x+2y=80......equation IV

subtract equation III from equation IV(equation IV - equation III)

we will arrive at:
2x=24

to get X...
We will divide both side by 2...
Therefore,our X equals to 12


to get our Y.we will substitute 12 for X in equation I

dont forget equation I is ....X+Y=28

12+Y=28
subtract 12 from both sides...
12-12+Y =28-12
Y=16...

Inconclusion,we have 12CHICKEN AND 16RABBIT

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by FisifunKododada: 8:50pm On May 01, 2017
grin Holy Crap!!!!!!! Akin na confirmed wizard - what da fvck. Mehn. angry

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by FisifunKododada: 8:50pm On May 01, 2017
shocked Guys no need to turn this tribal. We are all Nigerians - Yoruba, Igbo or Hausa. Also, I think Akin should stop participating in Nairaland math competitions. Like Yungi said his brain is too hot. Akin should just leave this money for those who really need it.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by FisifunKododada: 8:50pm On May 01, 2017
cool
Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by Barezzi(m): 8:55pm On May 01, 2017
Chai! My brain Don rust...

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by Jajayi: 9:00pm On May 01, 2017
Since Chickens have two legs, multiply the given number by two, 28 x 2 = 56. You said there are 80 legs including that of rabbits, therefore 80 - 56 = 24. The 24 represents the rabbits' legs since they have four, so 24/2 = 12 rabbits.

To find the number of chickens, 28 - 12 = 16 chickens

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by nwaanambra1(m): 9:03pm On May 01, 2017
y am i. . . undecided


why am i having this feeling that @ YungMillionaire and @AkinPhysicist are one and the same person - trying to attract attention to himself

meanwhile this reasoning question has been there for ages and was copied and modified its called "the head and leg logic reasoning". google has it.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by FisifunKododada: 9:26pm On May 01, 2017
nwaanambra1:
y am i. . . undecided


why am i having this feeling that @ YungMillionaire and @AkinPhysicist are one and the same person - trying to attract attention to himself

meanwhile this reasoning question has been there for ages and was copied and modified its called "the head and leg logic reasoning". google has it.

Bruh I doubt it. Akin is a sharp guy. He is very quick - you just haven't seen him in action. However, I agree that for him to answer this quickly, he must have solved the problem somewhere before. Very likely. But am not sure.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by GodIsBiafran: 9:32pm On May 01, 2017
nwaanambra1:
y am i. . . undecided


why am i having this feeling that @ YungMillionaire and @AkinPhysicist are one and the same person - trying to attract attention to himself

meanwhile this reasoning question has been there for ages and was copied and modified its called "the head and leg logic reasoning". google has it.

bia forget dat thing. They are not the same. That Akin na sharp guy. I once posted a topic on Biafra and 2 minutes after I posted the guy replied with two solid paragraphs of anti-Igbo nonsense. The guy is an Igbo-hater but he is very smart. I suspect he uses dictation apps.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by AkinPhysicist: 9:35pm On May 01, 2017
dingbang:
Na only u post am .. Only u come solve am..

Wetin dis one the talk. No be the same brain we carry come this world o! Man pass man. I pass you. No vex. See your fellow Ipob below testifying to my brain power. No be mouth.

GodIsBiafran:


bia forget dat thing. They are not the same. That Akin na sharp guy. I once posted a topic on Biafra and 2 minutes after I posted the guy replied with two solid paragraphs of anti-Igbo nonsense. The guy is an Igbo-hater but he is very smart. I suspect he uses dictation apps.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by AkinPhysicist: 9:37pm On May 01, 2017
Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by CACAWA(m): 9:38pm On May 01, 2017
AkinPhysicist:


Wetin dis one the talk. No be the same brain we carry come this world o! Man pass man. I pass you. No vex. See your fellow Ipob below testifying to my brain power. No be mouth.

lol how can you sound so confident? I challenge you to a test!.

Is there any online competition we could do? Maths btw.

1 Like

Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by ZombiePUNISHER: 9:39pm On May 01, 2017
Barezzi:
Chai! My brain Don rust...
Join the club
Wetin full am na afonja grin

1 Like

Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by YungMillionaire: 9:45pm On May 01, 2017
nwaanambra1:
y am i. . . undecided


why am i having this feeling that @ YungMillionaire and @AkinPhysicist are one and the same person - trying to attract attention to himself

meanwhile this reasoning question has been there for ages and was copied and modified its called "the head and leg logic reasoning". google has it.

Please don't derail this thread. See my post above as to how Akin solve this so quickly. I don't have time for childish games.

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by AkinPhysicist: 9:48pm On May 01, 2017
CACAWA:
lol how can you sound so confident? I challenge you to a test!.
Is there any online competition we could do? Maths btw.

Look here. I shall wipe the proverbial floor with your mediocre brain. grin

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Re: Nairalander Offers 10 Thousand Naira For Anyone Who Solves This Logical Riddle by nwaanambra1(m): 9:54pm On May 01, 2017
YungMillionaire:


Please don't derail this thread. See my post above as to how Akin solve this so quickly. I don't have time for childish games.

ok. my bad. sorry.

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