Question
If 519x238y is divisible by 72, then find (2x -
4y).Solution
ATQ,
Divisibility by 8: Last 3 digits = 38y
Try y = 4 → 384 ÷ 8 = 48 ✅
Now check sum for divisibility by 9:
5 + 1 + 9 + x + 2 + 3 + 8 + 4 = (32 + x)
x = 4 → 36 ✅
Required value = (2 × 4 - 4 × 4) = (8 - 16) = -8
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