Q 2346501473.     A group of workers were working on the construction of building. From the second day onwards, one worker was withdrawn each day. The construction was finished when the last worker was withdrawn. Had no worker been withdrawn at any stage, the group would have finished the construction in 70% of the time. How many workers were there in the group?

IBPS-PO 2017 Mock Mains
A

20

B

30

C

50

D

10

E

None of these

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