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150 workers were engaged to finish a pie...

150 workers were engaged to finish a piece of work in a certain number of days. Four workers dropped from the work on the second day. Four workers dropped on third day and so on. It took 8 more days to finish the work. Find the number of days in which the work was completed. [Let the no.of days to finish the work is 'r' then
`150 x = (x+8)/2 [2 xx 150 + (x+8-1)(-4)]`

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The correct Answer is:
25 days
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