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有若干水泵抽干一个池塘，由于某种原因，抽干池塘的时间延后 10 个小时。为了在原计划的时间内完成任务，需要增加水泵的数量
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有若干水泵抽干一个池塘，由于某种原因，抽干池塘的时间延后 10 个小时。为了在原计划的时间内完成任务，需要增加水泵的数量。如果增加 4 台，则抽干池塘的时间比原计划多了 4 个小时，若增加 10 台，则比原计划提前 2 个小时抽干池塘。已知每台水泵的效率相同，为了按期完成任务，最少需要增加 ( ) 台水泵。

A 9
B 8
C 7
D 6

正确答案
A
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