Let present age of sahil is 'x'
his mother age is '3x'
after five years
sahil's age is 'x+5'
his mother's age is '3x+5'
according to problem,
given sum of their ages after five years is 66
sahil's age is x=14=14 years
sahil's mother age is 3x=3(14)= 42=42years