A piece of work was finished by A, B and C together. A and B together finished 60% of the work and B and C together finished 70% of the work. Whoamong the three is most efficient?

A piece of work was finished by A, B and C together. A and B together finished 60% of the work and B and C together finished 70% of the work. Whoamong the three is most efficient? Correct Answer C

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