An algebra problem by Sai Manisha
One man started a project on 1st day. One man joins on each day starting from the second day. The project will be completed in exactly 20 days . Instead, if a team of 7 men work regularly the work will be completed exactly in days. What is the value of ?
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1 solution
1day - 1 man 2 day - 2men 3 rd day - 3 men ' ' '
formula : (n*(n+1)^2)/2 using this formula we get 210 7 D (days)=210 D=210/7 ans : 30 days