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2015-05-11T18:52:33+08:00

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Let Cherry's age now be C and May's present age be M
C-4=4(M-4) \\ C-4=4M-16 \\ C=4M-12 and C=3M
So that means:
4M-12=3M \\ M=12

Therefore May is 12 years old and Cherry is 36.
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