Question 1024218

10 workers can do  work in 20 days , when they start the work , after how many days should 5 workers leave the work so that the work would be finished in 35 days ?
<pre>After {{{highlight_green(matrix(1,4, 2&1/2, or, 2.5, days))}}} on the job, 5 workers can leave, and the remaining 5 workers will take 35 days to complete the {{{(7/8)^(th)}}} remaining work.