72
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Since 8 is a multiple of 4, it is automatically the LCM.
The lowest common multiple is 18. The first four common multiples are thus the first four multiples of 18 and are: 18, 36, 54 and 72.
The LCM of 12, 9, and 4 is 36. 9X4= 36 12X3=36
The lowest common multiple of 16 and 20 is 80.
12