128
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The least common multiple of 6 , 8 , 18 = 72
112*3=42*8=336
The least common multiple of the numbers 8 and 6 is 24.
Factors of 8 = [1, 2, 4, 8] Factors of 42 = [1, 2, 3, 6, 7, 14, 21, 42] Therefore common factor is 2 since we don't include 1. (Question is supposed to be 'highest' common factor)
The least common denominator of 6,7, and 8 is the least common multiple of those numbers. This is 168.