Dan can fill Q cans of water in 7 minutes. If there are R cans of water in one gallon, how many gallons can Dan fill in 42 minutes?	Choose the correct option:  A) 6QR  B) 6R/Q  C) 6Q/R  D) 7Q/R  E) 7R/Q
Dan can fill this number of cans in 42 minutes:  (42/7)= 
<gadget id="calculator"> (42/7)</gadget>
<output>6</output>
6Q.   One can is 1/R gallons.   Dan can fill 6Q*(1/R)= 6Q/R gallons of water in 42 minutes.   The answer is 6Q/R.
<result>C</result>
Dan can fill Q cans of water in 7 minutes. If there are R cans of water in one gallon, how many gallons can Dan fill in 42 minutes?