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P, Q and R can complete a work alone in 12, 15 and 20 days respectively. They started the work together. P left the work 8 days before the work was completed and Q left the work 5 days after P had left. R completed the remaining work alone. How many days will be required to complete the whole work?

 

[SSC CHSL 15th March 2023 Shift-4 With Answers]
A
B
C
D

EXPLANATION

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