Question

P and Q can do a work together in 30 days. Q and R can

do the same work together in 24 days and R and P together in 20 days. They started the work together, but Q and R left after 10 days. How many more days will P take to finish the remaining work?

A 23

B 21

C 18

D 19

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What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)

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P and Q can do a work together in 30 days. Q and R can

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