Question
If the 8-digit number 617x849y is divisible by 72, then
find the value of (6x - y).Solution
ATQ,
Divisibility by 8: Last 3 digits = 49y should be divisible by 8.
Try y = 6 → 496 ÷ 8 = 62 ✅
Now check divisibility by 9:
Sum = 6 + 1 + 7 + x + 8 + 4 + 9 + 6 = (41 + x) should be divisible by 9.
x = 4 → 45 ✅
Required value = (6 × 4 - 6) = (24 - 6) = 18
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