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A, B and C can do a piece of work in 20,...

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?

A

a. 8

B

b. 7.5

C

c. 7

D

d. 9

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ARIHANT SSC-PERMUTATIONS & COMBINATIONS -INTRODUCTORY EXERCISE -(19.2 )
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