A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:
A. 7/15
B. 8/15
C. 4/15
D. 7/20
E. 4/5
সঠিক উত্তরঃ
B.
8/15
Explanation:
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