Question

10 years before , the ages of father and son was in the ratio 5:2;at present their total age is 90 years. find the present age of son

Answer 1

Answer:

The son is 30 years old

Step-by-step explanation:

Let present age of father = x and present age of son = y

(x-10)/(y-10)=5/2

2(x-10)=5(y-10)

2x-20=5y-50

2x-5y= -30               ....(i)

x+y=90

x=90-y

Putting this value in (i),

2(90-y) - 5y = -30

180-2y-5y=-30

180+30=2y+5y

210=7y

y=30