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Re: If r is divisible by 10 and s is divisible by 9, rs must hav [#permalink]
15 Aug 2018, 08:19

1

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Explanation

This problem is most easily solved with an example. If r = 10 and s = 9, then rs = 90. The factors of 90 are 1 & 90, 2 & 45, 3 & 30, 5 & 18, 6 & 15, and 9 & 10. Count to get a minimum of 12 factors.
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