Question

Vijay is older then his sister by12 years.four years ago,Vijay was four times older as his sister.find the present age of them

Answer 1

Let vijay’s age be x and his sister’s age be y
According to first condition
X=y+12
X-Y = 12 —- eq 1
According to second condition
X-4=4(y-4)
X-4= 4y-16
X-4y=-12–eq 2
Sub 1 and 2
3y = 24
Y =8
X= 20