Question 165102
You need to find the Least Common Multiple of these numbers
3*7 = 21
I would find the LCM of 18 and 21
2*21 = 42 and 42/18 = 2.333
3*21 = 63 and 63/18 = 3.5
4*21 = 84 and 84/18 = 4.666
5*21 = 105 and 105/18 = 5.833
6*21 = 126 and 126/18= 7
So far 126 looks like the answer
126/3 = 42
126/7 = 18
126/18 = 7
What about 42?
42/3 = 14
42/7 = 6
42/18 = 2.333
Doesn't work
What about 63?
63/3 = 21
63/7 = 9
63/18 = 3.5
It appears they all line up again after 126 revolutions