Question

The total of three sisters' ages is 39. Dina is is half as old as Michelle and 3 years younger than Juliette. How old are the sisters?

Answer 1

Dina `=9` years old
Michelle `= 18` years old
Juliette `=12` years old

Explanation:

Let Michelle's age be`2x`
Given Dina is half as old as Michelle, `=>` Dina's age `=x`
Given Dina is `3` years younger than Juliette,
`=>` Juliette'a age `=x+3`
Given the sum of the three sisters' age is `39`,
`=> 2x+x+x+3=39`
`=> 4x+3=39`
`=> 4x=39-3=36`
`x=36/4=9`

Hence, Dina's age `=x=9`
Michelle's age `=2x=2*9=18`
Juliette's age `=x+3=9+3=12`

Check :

`9+18+12=39`, OK