The table below shows how often three different ...

asked Jan 4, 2017 in Mathematics by Saigonms
The table below shows how often three different gears complete one revolution in a machine. How many seconds pass before the gears align again? Gear. Revolution(s) A. 20 B. 30 C. 40

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answered Jan 4, 2017 by anonymous
You need to find the lowest common factor of all numbers, since each gear will be aligned when it is at a multiple of its # of seconds for a revolution.

The LCF is 120, so 120 seconds.

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