Question 1131997
{{{10r*15*8=1}}}--------------15 days at 10 hours per day is 120  hours.



{{{n*r*10*4=1}}}-------------n workers, for 10 days at 4 hours per day, same ONE ORDER



{{{10r*120=n*r*40}}}

{{{nr*40=1200r}}}

{{{n=1200/40}}}

{{{highlight(n=30)}}}