Q57
6 pipes, working 10 hours a day, can empty a cistern in 3 days. How many hours a day must 9 pipes work to empty the cistern in one day?
A.
20
AnswerB.
12
C.
22
D.
18
Answer: Option A
Solution
Answer: Option A
Solution:
6 × 10 × 3 = 9 × x × 1x = 20 Answer