Question

the present ages of A and B are in ratio 7:5 . ten years later ages will be in ratio 9:7 . find their present ages? (linear equation)

Answer 1

Let their present ages be A - 7x B - 5x


After 10 years

A - 7x + 10 or 9x

B - 5x + 10 or 7x

Then

7x + 10 = 9x
10 = 9x - 7x
10 = 2x
x = 10/2
x = 5


Present age
A = 5*7 = 35
B = 5*5 = 25

Answer 2

refer to the attachment ✌