Question

Which of the following equations represents the number of day in which B and C working together can finish the same work?

In the following coded arithmetic questions certain symbols are used with the following meaning:
I. P @ Q means add P to Q.
II. P # Q means subtract Q from P.
III. P $ Q means multiply P with Q.
IV. P ^ Q means divide P by Q. Now study the given information and answer the questions following it. Three persons A, B and C complete a work in 40 days. B and C together are 5/4 times as efficient as A and B together. On the other hand, A and C together are 7/5 times as efficient as B and C together.
A 40 $ 20 ^ (40 # 20)
B 20 $ (12 # 6) ^ 5
C 20 $ (12 # 6) ^ 3
D 40 $ (4 @ 4) ^ 5
E None of these
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