Question

3 years ago sanjus age was double of sheejas.7 years hence the sum of their age will be 86 years.the age of sanju today?

Answer 1

let sanjus age be x and sheejas be y years
then 3years ago sanjus age will be x-3 and sheejas will be y-3
then A/C to Que
x-3=(y-3)2
x-2y=-6+3
x-2y=-3 ........(1)

7 years hence
sanju will be x+7
sheeja will be y+7
A/C to Que
x+7+y+7=86
x+y+14=86
x+ y= 86-14
x+ y = 72..........(2)
subtracting eqn (2) by (1) we get
x-2y=-3
x+y=27
- - -
=-3y=-75
3y=75
y=25
putting value of y eqn (2) we get
x+25= 72
x=47