Question

Mary is twice as old as John and half as old as Bob. In 22 years' time, Bob will be twice as old as John. How old is Mary?

Answer 1

`m = 22`

Explanation:

`m = 2j = b/2 => 4j = b`

`b + 22 = 2(j + 22)`

`4j +22 = 2j + 44`

`2j = 22`

`j = 11`

`b = 44`