Let ages of S, A, P be s, a, p years respectively.
a + 5 = 2p
s/a=4/5
s + a + p = 37
ATQ, let s = 4x, a = 5x and p = (5x+5)/2
4x + 5x + (5x+5)/2 = 37
x = 3
present age of S = 4x = 4 × 3 = 12 years
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