120
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The least common multiple of 20, 40, and 60 is 120.
The LCM of 20 and 30 is 60. The multiples of 20 are 20, 40, 60, and so on. The multiples of 30 are 30, 60, and so on. So teh LCM of 20 and 30 is 60.
LCM 12 and 20 is 60.
The LCM is 80.
The answer is 40 because 20x2=40 and 5x8=40.