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Five years ago, Amy was three times as old as Mike. If Mike is 10 years old now, how old is Amy?

A 20

Mike is 10 years old now, so he must have been 5 years old five years ago. Amy was 3 times as old as Mike five years ago, so Amy must have been 15 five years ago. Add 5 years to Amy’s age five years ago to calculate her age now. Amy is 15 + 5 = 20 years old now.