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Pipe 'A' can fill a tank in 15 hours. Pipe 'B' is % as efficient as pipe 'A'. If both pipes are opened simultaneously, the tank will be completely full in hours.
The values given in which of the following options will fill the blanks in the same order in which is it given to make the statement true:
I. 100, 7.5
II. 20, 12.5
III. 66.67, 9

A Only I and II

B All I, II and III

C Only I and III

D Only III

E None

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