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12 June, 15:48

Mary is twice as old as Susan. Susan is five years younger than Janet. Janet is 12 years old. How old is Mary?

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  1. 12 June, 15:50
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    Mary is 14 years old.

    Step-by-step explanation:

    Susan is 5 years younger than Janet and Janet is 12. So 12-5=7 so Susan is 7 and Mary is 2x as old as Susan. Therefore you do 2*7 = 14.
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