The BrainBashers mechanical computer is a very sensitive device, it consists of interlocked toothed gear cogs.
The largest cog has 81 teeth and the others have 52, 36 and 20 respectively.
By accident, Daniel started to rotate the largest cog.
How many revolutions must he rotate the largest cog make before the computer is back in its starting position with all of the cogs where they started?
[Ref: ZAVS] Copyrighted
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