Question

Jinu's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present?

Answer 1

Jinu's mother's present age =x
Jinu's present age =2x/5
After 8 years
mothers age=x+8
jinu's age=(x+8(/2
i.e,2x/5+8=(x+8)/2
=>(2x+40)/5=(x+8)/2
=>x=4

Answer 2

Jinu's mother's present age = x
Jinu's age = (2/5)x
After 8 years Jinu's mother's  age = x+8
After 8 years Jinu's  age = (2/5)x +8
(2/5)x +8  =  (x+8)/2
(2x+40)/5  =  (x+8)/2
(2x+40)*2  =  (x+8)*5
4x+80 = 5x+40
x = 40
Jinu's mother's present age = 40 years