Q10 of 28 Page 11

A and B can polish the floors of a building in 10 days. A alone can do th of it in 12 days. In how many days can B alone polish the floor?

Given,


A and B can polish a building in = 10 days


A alone can do of it in 12 days


(A+B)’s 1 day work =


A’s I day work =


B’s 1 day work = (A+B)’s 1 day work – A’s 1 day work =


Thus B can finish the work in = days.


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8

A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. How much time will A alone take to finish the work?

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A, B and C can reap a field in days; B, C and D in 14 days; C, D and A in 18 days; D, A and B in 21 days. In what time can A, B, C and D together reap it?

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A and B can finish a work in 20 days. A alone can do th of the work in 12 days. In how many days can B alone do it?

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A and B can do a piece of work in 20 days and B in 15 days. They work together for 2 days and then A goes away. In how many days will B finish the remaining work?