SOLUTION: A boys age is 3 times that of his sister. In 6 years, it will be twice as great. How old are they now?

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Question 720840: A boys age is 3 times that of his sister. In 6 years, it will be twice as great. How old are they now?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Here is a start:

b for boy, g for sister (girl).
Age Now, b=3g.
In six years, b%2B6=2%28g%2B6%29.

Finish from there.