Question 1202190
Peter is now 12 years old and John is 3 years old. In how many years will Peter be twice as old as John?

Let Peter's age after x years be twice that of John


Peter is now 12 years old  . After x years he will be 12+x years

John is 3 years old. After x years he will be 3+x years



12+x = 2(3+x)

12+x = 6+2x
2x-x = 12-6

x =6   After 6 years