Ella can fill K cans of water in 4 minutes. If there are T cans of water in one gallon, how many gallons can Ella fill in 36 minutes? Pick:
A) 4T/K
B) 4KT
C) 9T/K
D) 9K/T
E) 9KT
Ella can fill this number of cans in 36 minutes:  (36/4)= 
<gadget id="calculator"> (36/4)</gadget>
<output>9</output>
9K.   One can is 1/T gallons.   Ella can fill 9K*(1/T)= 9K/T gallons of water in 36 minutes.   The answer is 9K/T.
<result>D</result>
Ella can fill K cans of water in 4 minutes. If there are T cans of water in one gallon, how many gallons can Ella fill in 36 minutes?