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posted by adis on Thursday, December 27, 2012 at 10:22am.
the father is 3 times as old as his son in 10 years time he will be double of his sons age find their peasant age ?
f = 3s 3s+10 = 2(s+10) s = 10 f = 30 check: in 10 years, 40 = 2*20
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