mother is thrice sons age .10 years earlier son was 20 years younger than his mother .Find their present ages

Answer 1

m = 3s

m-10 = s-10 + 20 = s + 10

3s - 10 = s + 10

2s - 10 = 10

2s =20

s = 10

mom 30, son 10

10 years ago, mom was 20 and son was newborn