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# 50 persons can complete a piece of work in 50 days. How many persons with twice the efficiency will complete the same piece of work in 10 days?

[ A ]    110
[ B ]    115
[ C ]    120
[ D ]    125
[ E ]    None of these
 Answer : Option D Explanation : For 50 days, the number of persons required = 50 For 10 days, the number of persons required = $50 \times 50 \over 10$ = 250 As efficiency is double, so persons required = 125