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Question

A can complete 25% of work in five days. And this takes four days more than B to complete the whole work. They started the work together but after X days A left and C was 50% as efficient as a joined B and completed the whole work with him. If the total work got completed in 2X days, then find the value of
X.

A 3

B 4

C 6

D 5

E 7

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