Q 1463312245.     A and B together can complete a task in 7 days. B alone can do it in 20 days. What part of the work was carried out by A?

I. A completed the job alone after A and B worked together for 5 days.

II. Part of the work done by A could have been done by B and C together in 6 days.

A

I alone sufficient while II alone not sufficient to answer

B

II alone sufficient while I alone not sufficient to answer

C

Either I or II alone sufficient to answer

D

Both I and II are not sufficient to answer

E

Both I and II are necessary to answer

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