SOLUTION: Ben is r years old. His sister is three times as old as he is. How old is his sister

SOLUTION: Ben is r years old. His sister is three times as old as he is. How old is his sister

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Question 1147986: Ben is r years old. His sister is three times as old as he is. How old is his sister
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
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His sister is  r + r + r = 3r  years old.

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