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14 pumps of equal capacity can fill a tank in 6 days. If the tank has to be filled in 4 days, the number of extra pumps needed is. [UDC 1993] | |
A. | 7 [Correct Answer] |
B. | 21 [Wrong Answer] |
C. | 14 [Wrong Answer] |
D. | 28 [Wrong Answer] |