Question
Compute the maximum total of (r + s) if ‘6r427s8’ is
divisible by 12.Solution
ATQ,
Check divisibility by 4 and 3.
Last two digits: ‘s8’ ⇒ s = 0, 2, 4, 6, 8
Maximum s = 8
Sum = 6 + r + 4 + 2 + 7 + 8 + 8 = 35 + r
35 + r divisible by 3 → r = 1, 4, 7
Max r = 7
Max (r + s) = 7 + 8 = 15
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