math
posted by mr.smarty pants .
The least number of pens required to make complete sets of 20, 24, 30, are?

This is the same as finding a Lowest Common Denominator
20 = 2*2*5
24 = 2*2*2*3
30 = 2*3*5
so we need: 2*2*2*3*5 or 120
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