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!

19,38,43

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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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.

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

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.

Joystark:


Na una dey intimidate person dat year with calculation.

Thumbs up man.

No o ... I just dey form e-professor oh.

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.

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

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.

..

Wetin concern agboro with overload

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

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.

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

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

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

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

naturalwaves:

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


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.

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

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

Ok

19.

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

I usually sit at the back in math class

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

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

All those above calculations dey do my eyes somehow. Mathematics isn't just my thing, don't know why?

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

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.