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Anonymous
The first five common multiples of seven and twenty are: 140, 280, 420, 560, 700.
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7 and 20 can go into multiples of 140.
140, 280, 420, 560, 700
1 and 7 can go into 7
The LCM of 5, 7, and 20 is 140.
140
LCM(12, 18, 7, 20) = 1260
Any multiple of 42