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Mathematics 14 Online
OpenStudy (anonymous):

Kelly is four years old. Bradley is three times as old as Kelly. When Kelly turns twelve, how old will Bradley be?

OpenStudy (ipwnbunnies):

So, when Kelly is age 4, Bradley is 3 times as old. 4*3 = 12 Bradley is 12 when Kelly is 4. There is an 8 year difference. So, when Kelly is 12, Bradley must be 12+8.

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