150 workers were engaged to finish a piece of work in a certain number of
days. Four workers dropped the second day, four more workers dropped
the third day and so on. It took 8 more days to finish the work. Then find
the number of days in which the work was completed.

• let earlier work would be completed in x days
  so now it would take (x+8) days to complete the work
  so 150x=150+142+.........(x+8) terms
  150x=(x+8)(300-(x+7)4)/2 -------using sum of A.P
  solving for value of x we get x=17
  so the work now would be completed in 17+8=25 days
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