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Re: If z is the only two-digit number that is divisible by both 12 and 21,
[#permalink]
18 Sep 2022, 15:56
Expert Reply
OE
Quote:
If z is the only two-digit number divisible by both 12 and 21, it must be the smallest common multiple. To find the least common multiple of 2 numbers, divide by product of the numbers by any common factors. The only common factor of 12 and 21 is 3, so the least common multiple is 12(21)/3 = 4(21) = 84, choice (D).
gmatclubot
Re: If z is the only two-digit number that is divisible by both 12 and 21, [#permalink]