The LCM is 300.
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The multiples of 20 are: 20, 40, 60, 80, 100, 120, 140, etc ...The multiples of 30 are: 30, 60, 90, 120, 150, etc ...The multiples of 40 are: 40, 80, 120, 160, etc. ...The lowest multiple common to 20, 30, and 40 is 120, so the LCM = 120
150
The least common multiple of 30 , 25 = 150
450
The least common multiple (LCM) of 30, 18, and 100 is 900.