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Mercy is now five times as old as her son. In six years’ time she will be three times as old as her son. If her son is x years old now, which one of the following equations represents their ages in six years time?
A. 5x+6=3x-18
B. 5x+6=3x+16
C. 5x+6=3x+18
D. 5x+6=3x+12