Running at the same constant rate, 8 identical machines can produce a total of 240 pens per minute. At this rate, how many pens could 5 such machines produce in 5 minutes?  Choose the correct choice from the following
A) 114	B) 108	C) 192	D) 750	E) 777
Let's take the approach that uses the answer choices to eliminate wasted time.   240/8= 
<gadget id="calculator">240/8</gadget>
<output>30</output>
30 pens per minute per machine.5 machines= 150 per minute. 5 minutes worth =750 pens.   Looking at the answers it is clear...we can only choose (D).   THE CORRECT ANSWER IS 750.
<result>D</result>
Running at the same constant rate, 8 identical machines can produce a total of 240 pens per minute. At this rate, how many pens could 5 such machines produce in 5 minutes?