21 and 35
7 and 15
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Two pairs of #'s with 10 as their least common multiple: 5x2 1x10
They are: 2 and 9, 1 and 18
5 and 21 15 and 7 35 and 3
(3, 36) and (4, 9)
Well, darling, any pair of numbers that are multiples of 10 would work just fine. For example, 10 and 20, or 30 and 10. As long as 10 is the smallest number that both pairs can be evenly divided by, you're good to go. Math can be a real hoot sometimes, can't it?