I believe the answer to this is 60, and 20 and 40 aren't divisible by 6.
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The Least Common Multiple (LCM) for 4 6 9 20 is 180.
LCM(6, 20, 19) = 1140
The LCM of 4 and 5 is 20.
The LCM is: 60The least common multiple of 5, 6 and 20 is 60.You can determine this by looking at the multiples of each number individually and seeing when they match:5: 5, 10, 15, 20...606: 6, 12, 18, 24...6020: 20, 40, 60
The LCM is 20.