Four years ago Sumon's age was half of what it will be in eight years. How old is Sumon?

Four years ago Sumon's age was half of what it will be in eight years. How old is Sumon? Correct Answer 16

Let Sumon's age be S. Four years ago, his age was (S - 4). After eight years, his age will be (S + 8). Then,  S - 4 = (S + 8)/2 or,   2(S - 4) = S + 8 or,   2S - 8 = S + 8 or,   2S - S = 8 + 8  or,    S = 16 years.
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