Solve.A water tank can be filled in 5 minutes and emptied in 8 minutes. If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
A. 3 min
B. 26 min
C. 15 min
D. 13.33 min
Answer: D
Mathematics
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?
?
A. 
B. 
C. 
D. 
E. 
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Solve the problem.Find the probability of getting 2 tails when 3 fair coins are tossed.
A. 
B. 
C. 
D. 
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Find a so that the statement is true.
A. 3 B. 4 C. 5 D. 2 E. 0
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