A is 50% as efficient as B. C does half of the work done by A and B together. If C alone does the work in 20 days, then A, B and C together can do the work in

A is 50% as efficient as B. C does half of the work done by A and B together. If C alone does the work in 20 days, then A, B and C together can do the work in
1). $5\frac{2}{3}$ days
2). $6\frac{2}{3}$ days
3). 6 days
4). 7 days

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