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6 . A and B can do a job together in 7 days. A is 13/4 times as efficient as B. The same job can be done by A alone in
 A. (A's 1 day's work) : (B's 1 day's work) = 7/4 : 1   =   7 : 4. B. Let A's and B's 1 day's work be 7x and 4x respectively. C. Then, 7x + 4x = 1/7     =>     11x = 1/7     =>     x = 1/77 . D. Therefore A's 1 day's work = ( 1/77 x 7 ) = 1/11  = 11 days

7 . X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days. How long will they together take to complete the work?
 A. 40/3 days B. 27 days C. 33 days D. 15 days

8 . A and B complete a work in 6 days. A alone can do it in 10 days. If both together can do the work in how many days?
 A. 3.75 days B. 4 days C. 5 days D. 6 days

9 . A and B together can do a piece of work in 8 days. If A alone can do the same work in 12 days, then B alone can do the same work in?
 A. 20 days B. 16 days C. 24 days D. 28 days

10 . A can do a piece of work in 4 days. B can do it in 5 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?
 A. 10 days B. 20 days C. 5 days D. 4 days

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