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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:

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!

Cc
Lalasticlala
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.

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477 Likes 36 Shares

Re: How Old Is She, Her Mum, And Her Dad? by Nobody: 3:55pm On Apr 07, 2019
Bizmagnet:

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.
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:
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

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:


Na una dey intimidate person dat year with calculation.

Thumbs up man.
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:
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


Bizmagnet:

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.
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:



See the beauty of mathematics. two different methods but still arrived at the same answer.
Let me give you another approach by taking it from the back this time grin

frankomale1:

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!

Cc
Lalasticlala
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
grin
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 shagrin

the reasons I still have my money in the bank is because there's no X in banks

59 Likes 6 Shares

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:

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.
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:

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.
Gbam cool

19 Likes 1 Share

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 wink

This how me n my fellow bad mathematicians look d thread

51 Likes 2 Shares

Re: How Old Is She, Her Mum, And Her Dad? by IkpuMmadu: 8:01pm On Apr 07, 2019
asuustrike1:

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.

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:
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!



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:

Let me give you another approach by taking it from the back this time grin


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.
cool

15 Likes

Re: How Old Is She, Her Mum, And Her Dad? by martowskin1(m): 8:02pm On Apr 07, 2019
emmyt2:
Wetin concern agboro with overload


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. smiley
Re: How Old Is She, Her Mum, And Her Dad? by wellmax(m): 8:03pm On Apr 07, 2019
derrydinny:
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

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 grin

1 Like

Re: How Old Is She, Her Mum, And Her Dad? by AngelicBeing: 8:04pm On Apr 07, 2019
CodeTemplar:
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
cool

7 Likes

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? undecided

5 Likes

Re: How Old Is She, Her Mum, And Her Dad? by Obito555(m): 8:05pm On Apr 07, 2019
frankomale1:
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!




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:
Wetin concern agboro with overload

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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