Question 1143824
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If it takes 3 identical  copy machines to make 180 copies in a minute, THEN the rate of work of any of the 3 copy machines 
is 180/3 = 60 copies per minute.


Hence, 10 machines in 5 minutes will make  10*5*60 = 3000 copies.    <U>ANSWER</U>
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Very simple solution.