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27 November, 04:27

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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  1. 27 November, 07:05
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    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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