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There are three pulleys connected to one another. The one on

Expert replies
by Max@Math Revolution » Wed May 25, 2016 2:51 am
There are three pulleys connected to one another. The one on the left has a radius of 8, has number 1,2,3,4 marked clock-wise (arrow is pointing at 0). The one on the right has radius of 12 and has 1,2,3,4 marked clock-wise (again, arrow pointing to 0). The one at the bottom is a pulley with a radius of 4. If the bottom pulley turns 1&1/2 times anti-clockwise, what is the sum of the numbers that the arrows of the two pulleys on the upper part of the figure would be pointing at after 1&1/2 turns?

A. 3
B. 4
C. 5
D. 6
E. 7

*An answer will be posted in 2 days.
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Source: — Problem Solving |

by Max@Math Revolution » Thu May 26, 2016 4:16 pm
The left pulley points at 4 and the right pulley points at 3, which means we get 4+3=7. Hence, the correct answer is E.
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