Two gears

Two gears with 13 and 7 teeth rotate locked into each other. How many turns does a big wheel have to make for both wheels to be in the starting position again?

Correct result:

x =  7


13 ... primenumber 7 ... primenumber LCM(13,7)=713=91  s=LCM(13,7)=91 x=s/13=91/13=7

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