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Question 1:
A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 liters a minute into the cistern, and both emptied in 24 minutes. How many liters does the cistern hold?
A. 480 liters
Feedback 1/x - 1/20 = -1/24
x = 120
120 * 4 = 480
B. 600 liters
C. 720 liters
D. 800 liters

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