Posted by srihita on Saturday, March 24, 2012 at 6:35pm.
38+x = 2(4+x)
38+x = 8 +2x
38-8 = 2x - x
30 = x
So, His age is 30+38 = 68
His son age is 30 + 4 = 34
difference is 68-34 = 30
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