Question

Manjit is now 12 years old and Mala is 2 years old .In how many year will manjit be 3 times as old as Mala

Answer 1

let the number of years after which manjit would be 3 times mala's age be x.
therefore (12+x)= 3 (2+x)
12+x=6+3x
transposing
12-6=3x-x
6=2x
therefore, x=3