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How Old Is She, Her Mum, And Her Dad? by frankomale1(m): 12:00pm On Apr 07, 2019 |
A girl went to school and the teacher asked, how old are you? She replied I don't know but I know that I'm half my mother's age. The teacher asked OK how old is your mother? She said I don't know but I know that my dad is 5 years older than my mother. The teacher, then asked how old is your dad? She said I don't know but I know that if we add our ages the answer is 100 years... Now, how old is the girl, her mum, and her dad? Please show your workings! 6 Likes 2 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by ShyWhale: 12:23pm On Apr 07, 2019 |
19,38,43 148 Likes 8 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by Bizmagnet: 12:36pm On Apr 07, 2019 |
frankomale1:Let mother's age be x, then the girl's age will be x/2 being the half of her mother's. Since the father's age is 5 years greater than the mother's, his age will be x+5. According to the girl, the sum of their ages is 100. Therefore, girl's age (x/2 years)+ mother's age(x years) + father's age((x+5)years) = 100. Now, x/2 + x + x+5= 100 2x + x/2 = 100-5 2x + x/2 = 95 4x + x = 190 5x = 190 x = 190/5 x= 38. Therefore, the mother is 38 years old, the girl is 19 years old and her dad is 43 years old. In other news Do you need a website/blog/software for your business, company or ideas today? Contact me through my signature to get the best and the affordable. 477 Likes 36 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by Nobody: 3:55pm On Apr 07, 2019 |
Bizmagnet:Absolutely correct. Am impressed in this analysis but your work isn't complete as you fail to show how you derived the ages for the others. Yes your work is good but to prove to novice who aren't versatile with calculations, you should show other workings even if it two lines. 38 Likes 2 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by CodeTemplar: 4:39pm On Apr 07, 2019 |
Let daughter's age be d That makes mom's age 2d and dad's own 2d+5 d + 2d + ( 2d + 5 ) = 100 d + 2d + 2d +5 = 100 5d + 5 =100 5d = 100 - 5 = 95 d = 95/5 =19 daughter's age is therefore 19 and mom's is 19 X 2 = 38 and dad's is mom's own + 5 and therefore 43 19 + 38 + 43 = 100 261 Likes 8 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by Joystark(f): 6:10pm On Apr 07, 2019 |
CodeTemplar: Na una dey intimidate person dat year with calculation. Thumbs up man. 127 Likes 4 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by CodeTemplar: 6:13pm On Apr 07, 2019 |
Joystark:No o ... I just dey form e-professor oh. 14 Likes |
Re: How Old Is She, Her Mum, And Her Dad? by FromZeroToHero(m): 7:07pm On Apr 07, 2019 |
CodeTemplar: Bizmagnet:See the beauty of mathematics. two different methods but still arrived at the same answer. 149 Likes 10 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by naturalwaves: 7:53pm On Apr 07, 2019 |
FromZeroToHero:Let me give you another approach by taking it from the back this time frankomale1:Let the father's age be = P Mother's age = P-5 since the father is 5 years older than her and daughters age = (P-5)/2 since her age is half of the mum's. (P-5)/2 + (P-5) + P = 100 (P-5) + 2(P-5) + 2P = 200 P-5 + 2P-10 +2P =200 5P= 200 + 15 5P= 215 P=215/5 P= 43 Father = 43 years old Mother= 43- 5(since the father is 5 years older)= 38 years old. Daughter= 38/2 (since her age is half of the mum's)= 19 years old. (F,M,D)= (43,38,19) is the required set of solution. 177 Likes 10 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by Obito555(m): 7:57pm On Apr 07, 2019 |
Re: How Old Is She, Her Mum, And Her Dad? by Upton: 7:58pm On Apr 07, 2019 |
.. |
Re: How Old Is She, Her Mum, And Her Dad? by Kelklein(m): 7:58pm On Apr 07, 2019 |
From the question Say daughter's age = x mom's age = 2x and dad's own = 2x+5 Sum the ages x + 2x + (2x + 5 ) = 100 x + 2x + 2x +5 = 100 5x + 5 =100 5x = 100 - 5 = 95 5x = 95 x = 95/5 =19 daughter's age(x) = 19 mom's age = 2 x 19 = 38 dad's age = mom's age + 5 = 38 + 5 = 43 49 Likes 3 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by emmyt2: 7:58pm On Apr 07, 2019 |
Wetin concern agboro with overload 8 Likes 1 Share |
Re: How Old Is She, Her Mum, And Her Dad? by Offpoint: 7:59pm On Apr 07, 2019 |
Dull people like us wey dey dey back seat when we see math question on board we....do the below picture God bear me witness I don't know what the hell those guys above are writing, small thing dem don carry X enter the matter... but the girl na idiot sha the reasons I still have my money in the bank is because there's no X in banks 59 Likes 6 Shares
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Re: How Old Is She, Her Mum, And Her Dad? by qanda: 7:59pm On Apr 07, 2019 |
Re: How Old Is She, Her Mum, And Her Dad? by Nobody: 8:00pm On Apr 07, 2019 |
Bizmagnet:you sabi math, see as you break everything. 9 Likes 1 Share |
Re: How Old Is She, Her Mum, And Her Dad? by AngelicBeing: 8:00pm On Apr 07, 2019 |
Bizmagnet:Gbam 19 Likes 1 Share
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Re: How Old Is She, Her Mum, And Her Dad? by Mutemenot(m): 8:01pm On Apr 07, 2019 |
This thread won't excel cos many Nairalander go japa at the sight of maths This how me n my fellow bad mathematicians look d thread 51 Likes 2 Shares
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Re: How Old Is She, Her Mum, And Her Dad? by IkpuMmadu: 8:01pm On Apr 07, 2019 |
asuustrike1: The clue is there. . Didn't you go to school Girl = ½ of mum age Mum is 5 years lesser than dad Divide the mum's age by 2 = girls age Add 5 to mum's age = fathers age It's deduction 5 Likes |
Re: How Old Is She, Her Mum, And Her Dad? by BlackPantherCri: 8:01pm On Apr 07, 2019 |
frankomale1: The student is very rude. She doesn't have home training 53 Likes 2 Shares |
Re: How Old Is She, Her Mum, And Her Dad? by AngelicBeing: 8:02pm On Apr 07, 2019 |
naturalwaves: 15 Likes
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Re: How Old Is She, Her Mum, And Her Dad? by martowskin1(m): 8:02pm On Apr 07, 2019 |
emmyt2: If na politics na, u go fit type full every where... This is not argument, all those politics e gladiators, make una come show una self here... I can see all of una reading 2 Likes |
Re: How Old Is She, Her Mum, And Her Dad? by derrydinny: 8:02pm On Apr 07, 2019 |
let the age of the kid be X her mothers age is 2X(2 times x) her fathers age is 2X+5 (fives years older than mother) the addition of their ages is 100 which means X+2X+2X+5=100 5X+5=100 5X=100-5 5X=95 x=19 2x=38 2X+5= 43 12 Likes 1 Share |
Re: How Old Is She, Her Mum, And Her Dad? by wellmax(m): 8:02pm On Apr 07, 2019 |
Ok |
Re: How Old Is She, Her Mum, And Her Dad? by Nobody: 8:03pm On Apr 07, 2019 |
19. |
Re: How Old Is She, Her Mum, And Her Dad? by wellmax(m): 8:03pm On Apr 07, 2019 |
derrydinny: Gbam. Simple and straightforward 4 Likes |
Re: How Old Is She, Her Mum, And Her Dad? by amaniro: 8:03pm On Apr 07, 2019 |
I usually sit at the back in math class 1 Like |
Re: How Old Is She, Her Mum, And Her Dad? by AngelicBeing: 8:04pm On Apr 07, 2019 |
CodeTemplar: 7 Likes
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Re: How Old Is She, Her Mum, And Her Dad? by anyimontana(m): 8:04pm On Apr 07, 2019 |
I still made it in life,bigtym without all dis maths that torment me that year Thank God for every. Its a pity that many died poor with all dis knowledge .may heat stroke kill algebra especially, IJN 3 Likes 1 Share |
Re: How Old Is She, Her Mum, And Her Dad? by oloriLFC(f): 8:04pm On Apr 07, 2019 |
All those above calculations dey do my eyes somehow. Mathematics isn't just my thing, don't know why? 5 Likes |
Re: How Old Is She, Her Mum, And Her Dad? by Obito555(m): 8:05pm On Apr 07, 2019 |
frankomale1: Wait !!!!Am still calculating Ok ans is 12,371 3 Likes |
Re: How Old Is She, Her Mum, And Her Dad? by obashiakpu(m): 8:06pm On Apr 07, 2019 |
emmyt2: E go concern no be only agbero but the driver, conductor, police on d road plus including passengers and passersby. Maths is real for your good and good of others. 1 Like |
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