The LCM is: 525
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Since 75 is a multiple of 25, all of its multiples are common.
The LCM of 25, 50, and 75 is 150. The multiples of 25 are 25, 50, 75, 100, 125, 150, and so on. The multiples of 50 are 50, 100, 150, and so on. The multiples of 75 are 75, 150, and so on. So the LCM is 150.
The least common multiple of 75 and 100 is 300.
3:3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63,66,69,72,75,78,81,84,87,90,93,96,99 15:15,30,45,60,75,90,105
The multiples of 20 are 20, 40, 60, 80, 100, 120... The multiples of 30 are 30, 60, 90, 120, 150... The multiples of 15 are 15, 30, 45, 60, 75, 90, 105, 120, 135... The common multiples of 20, 30, and 15 are 60, 120, 180, 240...