Question 1185818
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<pre>

The total food supply at the canteen is  520*8  units.


With 520 + 312 workers, it will be consumed in  {{{(520*8)/(520+312)}}} = 5 days.




In the short form, the setup equation is  


    520*8 = (520+312)*x,


where x is the number of days.


From this equation, you get  x = 5 days.    <U>ANSWER</U>
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Solved.