alleryPick the number whose digits add up to a multiple of 9.
A4,687
B4,689
C4,688
D4,690
Answer & Solution
Correct answer: B. 4,689
1. For 9, the digit sum must be divisible by 9.
2. 4,689 gives 4 + 6 + 8 + 9 = 27, which is divisible by 9; the others give 25, 26 and 19.
3. So only 4,689 passes.
_Source: Wikipedia, Divisibility rule, section Divisibility by 3 or 9_
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