Question

A boy is older than his sister by 3 years five years ago, the ratio of their ages was 4:3. Find the present age. let the age of the boy be b and the age of the sister be s​

Answer 1

Let brother's present age be x and sister's present be y

x=y+3

5 years ago

x-5/y-5=4/3

Putting the value of x

y+3–5/y-5=4/3

y-2/y-5=4/3

3(y-2)=4(y-5)

3y-6=4y-20

y=14

x=14+3=17

Brother's present age =17years, sister's present age=14years