1.

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. Who among the three is most efficient?1). A2). B3). C4). A or B

Answer»

Let the TOTAL AMOUNT of WORK be a

⇒ Work done by A and B together = 0.6a

⇒ Work done by C ALONE = a – 0.6a = 0.4a

⇒ Work done by B and C together = 0.7a

⇒ Work done by B alone = 0.7a – 0.4a = 0.3a

⇒ Work done by A alone = a – 0.7a = 0.3a

∴ the most efficient is C



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