Posted by **Sammyjoo** on Thursday, June 7, 2012 at 12:07am.

15) Marissa is 3 years older than her younger brother. Her older brother is twice as old as her younger brother. Her older brother is 18. How old are Marissa and her younger brother?

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**Rina**, Thursday, June 7, 2012 at 12:32am
Marissa is 12 which means the younger bro is 9

- Math -
**Sammyjoo**, Thursday, June 7, 2012 at 6:54am
I know the answer, but is there a special formula to work it out.

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