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150 workers were engaged to finish a job in a certain number of days. 4 workers dropped out on second day, 4 more workers dropped out on third day and so on.

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series will be like `150+146+142+..........+n`
work `= n/2(2+150+ (n-1)(-4))`
`= (152n-2n^2)`
if all are working then
w`= 150(n-8)`
`152n-2n^2 = 150n - 1200`
`2n^2 - 2n - 1200=6`
`n^2 - n-600=0`
...
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