Question

Mary is three times as old as her son . In 12 years Mary will be twice as old as her son. How old is each of them now?

Answer 1

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Answer:

Mary: 36

Mary's son: 12

Explanation:

Let s represent the son's age now. Then in 12 years, we have the relationship ...

2(s +12) = 3s +12

12 = s . . . . . . . . . . . subtract 2s+12 from both sides

Mary is 36; her son is 12.