If 5/7 of a cistern is filled in 30 minutes, then what is the time (in minutes) needed to fill the remaining part?

If 5/7 of a cistern is filled in 30 minutes, then what is the time (in

1.	If 5/7 of a cistern is filled in 30 minutes, then what is the time (in minutes) needed to fill the remaining part?
A.	12
B.	16
C.	18
D.	8
Answer» B. 16

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If 5/7 of a cistern is filled in 30 minutes, then what is the time (in minutes) needed to fill the remaining part?

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