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- Anonymous1 decade agoFavorite Answer
You can solve this consecutively. First, let us find LCM(12, 16).

It is 48. (This is because their GCD is 4, and LCM(12, 16) = 12*16/4 = 12*4 = 48).

And now let us find LCM(48, 20). It is 240. Again, first I found GCD(48, 20), which is 4 again. Then, LCM(48, 20) = 48*20/4 = 48*5 = 240.

So, the answer is 240.

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