Aperson is able to pull a rope with a force of 700 n. what is the minimum number of fixed and moveable pulleys that the person will require to lift up a 27,800 n elephant? assume the pulleys themselves are weightless and the system has 100% efficiency.

Each pulley reduces the extra effort compulsory to lift the elephant (light and 100% efficiency). If the elephant "weighs" 27,800 N and the person can apply 700 N,
27,800 / 700 = 39.7 which is about 40 N. 
The answer that offers a combined # of 40 pulleys is computed by:
40 / 2 = 20

Therefore the answer is 20 fixed and 20 moveable. 

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