What this maths question also show is Nairalanders can lie!. So, because someone answered correctly, everybody now get the same answer?. No single wrong answer?.

If a Nairalander tell you to COME you'd better RUN.

simple

x + 2x + ( 2x + 5 ) = 100

just solve for x and you get the girls age
2x is the mother's age and
2x + 5 is her dad's age

ALISMILE:
Guys try this one!

OK.

let R, C & D stand for Rabbit, Cat and Dog resp.

R + C = 10, equation 1
C + R = 24, eq 2
R + D = 20 eq 3
R+D+C =?

equate equation 1 to 2
R+C-10 = C+D-24
Make R subject of formula
R = D - 14.

substitute " - 14" for R in equation 3
(D - 14)+D = 20
D-14+D = 20
2D = 34
D = 17.

Now we know D, using equation 2:
C + D = 24
C + 17 = 24
C = 7.

Now we know C & D, using equation 1:
R + C = 10
R + 7 = 10
R = 3

Therefore, R + D + C = 27kg.

Solved in 20sec offhand.

denkyw:
if you can't beat them you join them

No pay others who can beat them, to beat them

Dad = 43
Mom=38
Child = 19
=100

Riclord001:
m=mother; d=daughter; f=father
m=2d; m+5=f; f+m+d =100

So?

xreal:
girl's age is 19
mother's age is 38, and
father's age is 43

when you add these three ages, you get 100.

Take one bottle for my head. I Solved this kind of question back in 2006 in aptitude test, when man still dey hustle.

Solution by mathematical Makasi

Let the formula become :

G+M+F=K..........A

Let M denotes the mothers age,then

G=M/2 meaning that the girl is half of her mothers' age. If this is so,then the mothers age is two times the girls age.

That is,

G=m/2, we clear fraction to have

2G=M

M=2G.........1

We are told that the girls father is 5 years older than the mum. This means that 5 must be added to what ever age her mum is.
That is

F=m+5
But m=2G therfore,

F=2G+5.........2

Now plug equation 1 and 2 into equation A, i.e,

G+2G+(2G+5)=k
By like terms we have

5G=k-5.

Multiply by 1/5 to have

G= 1/5(k-5)

G=k/5 -1

Now,since the age sum is 100, then k=100. We now have

G=100/5 - 1=20-1=19

Thus G=19. The girl is 19

Plug G=19 into equation 1 and 2 to have the mother and father's age.
That is,

M=2G
M=2(19)=38. Her mother is 38.


F= 2G+5=2(19)+5=43. Her dad is 43.


Let us see the veracity of equation A.

Solve for F from equation A to have.

F= K-G-M

But m=2G thus we have,

F=K-G-2G

F=K-3G.........B. It follows that equation B is F value, thus we plug equation B into F in equation A.

G+M+K-3G=K

G+2G+K-3g=K

3G-3G+K=K
But 3G-3G=0

Now k=K. The truthfulness of the equation A is proved.

Note that,

F=K-3G

When G=19, and k=100 then

F=100-57=43.

By makasimatics

xreal:
girl's age is 19
mother's age is 38, and
father's age is 43

when you add these three ages, you get 100.

thank you buh we really don't need to see d workings + ur handwriting is bad

9ite:
thank you buh we really don't need to see d workings + ur handwriting is bad

then pretend not seeing the workings.

9ite:
thank you buh we really don't need to see d workings + ur handwriting is bad

Lolz....

So computer now has bad writing?

koolet:
the girl 19, the mum 38, and the dad 43 =100

chicken bone

u made me remember my x and y.

my Simple method

solu..
Let the girls age be x
Mother's age is 2x
Father's age is 2x+5
X+2x+(2x+5)=100
5x+5=100
X=95/5=19
Therefore, the girls age is 19
Mother's age =19*2=38
Father's age =38+5=43

I used a wrong formulae I solved with x ,y ,z