Question

A is 15 years older then B. Ten years ago A was four times B's age. What are their ages now?

Answer 1

let a and b be current ages

a is 15 years older means

a = b+15

also 10 years ago

a-10 = 4*(b-10)

a = 4*b - 30

put a = b+15 in above equation

45 = 3*b

B = 15 years old

A = 30 years old