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2014-05-12T18:52:47+08:00

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Let x be son's present age.
     x+20 be Mang Cesar's present age.

3 (x+5) = (x+20) + 5

Solving for x, we have

3x + 15 = x + 25

3x - x = 25 - 15

2x = 10

x = 5

Therefore, the son's present age is 5 and Mang Cesar is 25.
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