B alone can complete a work in 12 days. How many days will A, B and C together takes to complete the work?
I. A and B together can complete the work in 3 days.
II. B and C together can complete the work in 6 days.
Options
- if the data in statement I is sufficient and II is not required;
- if the data in statement II is sufficient and I is not required;
- if the data in both statements is necessary;
- if the data in both statements is not sufficient to answer the question
CORRECT ANSWER : if the data in both statements is necessary;
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