SOLUTION: A boy is 4 years old and his sister is three times as old as he is. When the boy is 12 years old, how old will his sister be?

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Question 172270: A boy is 4 years old and his sister is three times as old as he is. When the boy is 12 years old, how old will his sister be?
Answer by Edwin McCravy(6936) About Me  (Show Source):
You can put this solution on YOUR website!
A boy is 4 years old and his sister is three times as old as he is. 

So he's 4 and she's 12.  So she is 8 years older than he is.

When the boy is 12 years old, how old will his sister be?

She will be 8 years older or 20.

Edwin