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There is a chain of five gear-wheels, identified as A to E, each one meshing properly with its immediate neighbour(s) in a straight line. The number next to each letter shows how many teeth that particular gear-wheel has.
A=48
B=16
C=64
D=24
E=32
When A is turned clockwise ten full turns, in which direction does E turn, and how many times?
A=48
B=16
C=64
D=24
E=32
When A is turned clockwise ten full turns, in which direction does E turn, and how many times?
Answer
Clockwise. 15 full turns.Hide Answer Show Answer
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Comments
The interesting thing about this one is that the number
of teeth on B through D is completely irrelevant: each gear moves 480 teeth
in the appropriate direction!
of teeth on B through D is completely irrelevant: each gear moves 480 teeth
in the appropriate direction!
what?
Yep, I spotted that too Dewtell. Tissue, do the math again and you will spot it. I can't show you here or I'll give the answer away and that will make Ade-Mad ;P. Send me a private message if you care about the working on this.
I think that if authors won't explain their answers in the first place, then the comments are fair game for publishing full solutions.
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