M alone can complete a work in 50 days and N alone can complete the same work in 100 days. If both of them work together, then in 25 days what percent of the total work will be completed?
A.55 percent
B.60 percent
C.80 percent
D.75 percent✓ Correct
Explanation
M's efficiency = 2 units/day, N's = 1 unit/day. Together = 3 units/day. In 25 days they complete 75 units out of 100 total units = 75%.
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