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Maths Tricks, Questions And Brain Teasers - Education (11) - Nairaland

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Re: Maths Tricks, Questions And Brain Teasers by denitro(m): 8:28pm On Feb 16, 2012
Raxxye:

I will ask "are u two twins?". From their answers, I'll be able to tell who d liar is

Nice try,
But you can only ask 1 question,
Re: Maths Tricks, Questions And Brain Teasers by mailkeem(m): 8:34pm On Feb 16, 2012
3x+4x=5x.

What is x?
Re: Maths Tricks, Questions And Brain Teasers by ACM10: 8:39pm On Feb 16, 2012
indoorlove:

A hunter  successfully shot a single  bird out of 10 that petch on a tree. How may birds would be left on the tree?

shocked
do we have double bird?
Re: Maths Tricks, Questions And Brain Teasers by ADEBYTE: 8:42pm On Feb 16, 2012
@maikeen

x=2
Re: Maths Tricks, Questions And Brain Teasers by moshoodn(m): 8:48pm On Feb 16, 2012
denitro:

Nice try,
But you can only ask 1 question,
i would ask. . .i learnt that that road over there leads to hell and giggle. . .
watch forn reactions.
Re: Maths Tricks, Questions And Brain Teasers by moshoodn(m): 8:55pm On Feb 16, 2012
brigglez:

If it takes 5hours for 3 shirts to dry up under the sun, how many hours will it take for 20 shirts to dry up under the sun?[size=8pt][/size]
its always five bro.
Re: Maths Tricks, Questions And Brain Teasers by mailkeem(m): 8:58pm On Feb 16, 2012
@ADEBYTE
Nice one
Re: Maths Tricks, Questions And Brain Teasers by moshoodn(m): 8:59pm On Feb 16, 2012
so many unanswered questions. . .
Re: Maths Tricks, Questions And Brain Teasers by ADEBYTE: 9:00pm On Feb 16, 2012
@moshood.
pls repost some of the unanswered question
Re: Maths Tricks, Questions And Brain Teasers by king100(m): 9:25pm On Feb 16, 2012
A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 2 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 8 hours.
What fraction of the tank (initially half-full) will be filled in 0.46 hours if all three pipes are in operation?


In one hour (1/2+1/3-1/4)=5/6
In two hours (5/6*2)=10/3
In 0.46hours (10/3*0.46)=1.53
Re: Maths Tricks, Questions And Brain Teasers by ImperialMcHael(m): 9:35pm On Feb 16, 2012
Raxxye:

I will ask "are u two twins?". From their answers, I'll be able to tell who d liar is

That's not the answer. The answer should be asking " If I was here 10 minutes ago, which way would you tell me to go?"
Now the good one will always tell the truth (+ * + = +)
while the bad man would initially lie then, and would also want to lie again about it ( - * - =+) thereby giving you the truth!
QED
Re: Maths Tricks, Questions And Brain Teasers by ImperialMcHael(m): 9:36pm On Feb 16, 2012
Raxxye:

I will ask "are u two twins?". From their answers, I'll be able to tell who d liar is

That's not the answer. The answer should be asking " If I was here 10 minutes ago, which way would you tell me to go?"
Now the good one will always tell the truth (+ * + = +)
while the bad man would initially lie then, and would also want to lie again about it ( - * - =+) thereby giving you the truth!
QED
Re: Maths Tricks, Questions And Brain Teasers by indoorlove(m): 9:40pm On Feb 16, 2012
ACM10:

shocked
do we have double bird?
thanks 4 the correction. I noticed it too buts seems nl has problems with post modification.
Re: Maths Tricks, Questions And Brain Teasers by somegirl1: 9:41pm On Feb 16, 2012
A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 2 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 8 hours.
What fraction of the tank (initially half-full) will be filled in 0.46 hours if all three pipes are in operation?


Ans:

large inlet fills 0.5 tank in 1 hr
small inlet fils 0.5 tank in 1/3 hr
outlet discharges 0.5 tank in 1/4 hrs

x= 1/2 tank + 1/2 * [0.46 (1+1/3-1/4)]tank
= 3/4
Re: Maths Tricks, Questions And Brain Teasers by Ozorhumphery(m): 10:04pm On Feb 16, 2012
If i drive at the speed of light and and turn on my head lights ,what will i see and why??
Re: Maths Tricks, Questions And Brain Teasers by ACM10: 10:24pm On Feb 16, 2012
Ozorhumphery:

If i drive at the speed of light and and turn on my head lights ,what will i see and why??

You'll see nothing!

Because you are travelling at the speed of light

cool
Re: Maths Tricks, Questions And Brain Teasers by Harbb: 10:52pm On Feb 16, 2012
Some chickens were crossing the road, 1 was infront of 2, 1 was in-between 2 and 1 was behind 2. How many chikens were there altogether?
Re: Maths Tricks, Questions And Brain Teasers by Physicist(m): 10:53pm On Feb 16, 2012
A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 2 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 8 hours.
What fraction of the tank (initially half-full) will be filled in 0.46 hours if all three pipes are in operation?


Big pipe fills  1/2  tank in 1 hour
Small pipe fills  1/6  tank in 1 hour
Outlet pipe reduces  1/8 tank in 1 hour
Water addition to tank  in 1 hour =(1/2  +  1/6  -1/cool  =  13/24  tank volume
Water addition to tank in 0.46 hour  = 0.46* (  13/24 )     =  46/100   *  (13/24)   =          598/2400 =  299/1200
Tank   initially half full =1/2 initially full or 600/1200 initially full
Tank fraction full after 0.46 hours  =   (600/1200)  + (299/1200)   =  899/1200.    Ans =899/1200                                
Re: Maths Tricks, Questions And Brain Teasers by ACM10: 11:00pm On Feb 16, 2012
Harbb:

Some chickens were crossing the road, 1 was infront of 2, 1 was in-between 2 and 1 was behind 2. How many chikens were there altogether?

9 chickens!
Re: Maths Tricks, Questions And Brain Teasers by somegirl1: 11:10pm On Feb 16, 2012
Harbb:

Some chickens were crossing the road, 1 was infront of 2, 1 was in-between 2 and 1 was behind 2. How many chikens were there altogether?

3
Re: Maths Tricks, Questions And Brain Teasers by ektbear: 11:33pm On Feb 16, 2012
If you mean exactly 1, then 3:

Chicken 1 <----------- Chicken 2 <--------- Chicken 3

If possibly more than 1, then any # of chickens >= 3.
Re: Maths Tricks, Questions And Brain Teasers by sparklebaby: 11:59pm On Feb 16, 2012
6 chickens crossin d road
Re: Maths Tricks, Questions And Brain Teasers by BlackPikiN(m): 12:23am On Feb 17, 2012
Solve this.

Re: Maths Tricks, Questions And Brain Teasers by Nobody: 2:52am On Feb 17, 2012
sauer on January 21, 2012, 09:55 PM:

From earlier:

Maggie Mathematical has five sons. One is called Alpha, another is called Beta, the third is called Gamma and the fourth is called Fred. What is the fifth son's name?


Thanks all!


Omega?
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 7:21am On Feb 17, 2012
mailkeem:

3x+4x=5x.

What is x?

ADEBYTE:

@maikeen

x=2

And can we have your workings!?
Flashboy, here is a challenge for you! tongue
Re: Maths Tricks, Questions And Brain Teasers by hbabe(f): 7:38am On Feb 17, 2012
Harbb:

Some chickens were crossing the road, 1 was infront of 2, 1 was in-between 2 and 1 was behind 2. How many chikens were there altogether?

5 chickens
Re: Maths Tricks, Questions And Brain Teasers by jedisco(m): 8:02am On Feb 17, 2012
denitro:

A town has a set of twins (1 is notorious for lying
and one for always telling the truth).
You come to the town and find yourself lost, then
on reaching a crossroad.
You meet this set of identical twins,
By asking one question to either of the twins, which question can you ask to enable you know
which road is the right road to follow
(*NB knowing fully well that if you ask the lying
one he will lead you astray)

ANSWER: you ask him 'if I meyour twin brother and asked him the right road to follow, which one would he show me?
Then you simply follow the opposite road of any one he shows you
Re: Maths Tricks, Questions And Brain Teasers by Killz3(m): 9:11am On Feb 17, 2012
Which is heavier: 1kg of sand or 1 kg of iron?
They are of equal weight! wink
Re: Maths Tricks, Questions And Brain Teasers by Nobody: 9:59am On Feb 17, 2012
~Killz~:

Which is heavier: 1kg of sand or 1 kg of iron?
Which is of larger volume?
Re: Maths Tricks, Questions And Brain Teasers by youngboss1(m): 10:41am On Feb 17, 2012
One
Re: Maths Tricks, Questions And Brain Teasers by NoQualms1(f): 12:52pm On Feb 17, 2012
jedisco:

ANSWER: you ask him 'if I meyour twin brother and asked him the right road to follow, which one would he show me?
Then you simply follow the opposite road of any one he shows you

I remove head dress for you. You are plenty much smiley
Re: Maths Tricks, Questions And Brain Teasers by NoQualms1(f): 12:55pm On Feb 17, 2012
sauer:

Which is of larger volume?

If the Iron is not in powder form (ground), it is of larger volume

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