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Question

'X', 'Y', and 'Z' can complete a job individually in 20 days, 30 days, and 24 days respectively. 'Y' and 'Z' begin the task together. After 6 days, 'Z' leaves and 'X' joins 'Y' to finish the job. Determine the total number of days required to complete the task.

A 27.2

B 12.6

C 33.5

D 10.5

E None of these

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