The table below shows how often three different ...

asked Jan 4 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 45

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1 Answer

answered Jan 4 by anonymous
Find the lowest common multiple of the three numbers. It has to be common for them all to align.

The LCM is 180, so 180 seconds.

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