60 (15 = 3*5, 12=2*2*3 -> 2*2*3*5 = 60)
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60 is the lowest common multiple of 20 and 15.
15.
The least common multiple (LCM) is: 240
The least common multiple (LCM) is: 195
Multiples of 3: 3 6 9 12 15 18Multiples of 4: 4 8 12 16The lowest multiple that is common to both 3 and 4 is 12.