A can complete a project in 20 days and B can complete the same project and B start working on the project together and A quits 10 days before in 30 days. If A the project is completed, in how many days will the project be completed?
A. 15
B. 16
C. 18
D. 21
E. none of these
সঠিক উত্তরঃ
C.
18
Explanation:
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