SOLUTION: John, twelve years old, is three times as old as his brother. How old will John be when he is twice as old as his brother?

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Question 9084: John, twelve years old, is three times as old as his brother. How old will John be when he is twice as old as his brother?

Answer by bonster(299) About Me  (Show Source):
You can put this solution on YOUR website!
12=3x
x=4

his brother is 4 years old right now.

4 and 12
5 and 13
6 and 14
7 and 15
8 and 16

since 8 is half of 16, John will be 16 when he is twice as old as his brother.