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I have this tricky math question.

Peter and his big sister Lisa are together 11 years old. The product of their age is equal to the age of their father. When Peter was born the father was 8 times older than Lisa. How old are Lisa and Peter?

You can put up the info in the text like this:

1. Peter + Lisa = 11

2. Peter * Lisa = Fathers age

3. Fathers age = Lisa * 8

Well I have tried to solve this but without any help.

Anybody know how to do this?

Thanks.