The water level in a rectangular swimming pool measuring 40 feet by 25 feet is to be lowered by 6 inches. How many gallons of water must be removed? (1 cu ft = 7.5 gallons) Choose the correct choice from the following answers:
A) 100
B) 250
C) 750
D) 3750
E) 5625
6 inches = 1/2 feet (there are 12 inches in a foot.), so  40*25*1/2= 
<gadget id="calculator"> 40*25*1/2</gadget>
<output>500</output>
500 feet^3 of water must be removed, which equals to   500*7.5= 
<gadget id="calculator">  500*7.5</gadget>
<output>3_750</output>
3750 gallons.   Answer: 3750.
<result>D</result>
The water level in a rectangular swimming pool measuring 40 feet by 25 feet is to be lowered by 6 inches. How many gallons of water must be removed? (1 cu ft = 7.5 gallons)