150 workers were engaged to finish a piece of work in a certain number of days. Four wirkers dropped from the work in the second day. Four workers dropped in 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 'x' then
`150x = (x+8)/2[2 xx 150 + (x+8-1)(-4)`]

Answer

25 days