Arithmetic Ability
Time and Work

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Q.

A is twice efficient as B and together they do the same work in as much time as C and D together. If C and D can complete the work in 20 and 30 daysrespectively, working alone ,then in how many days A can complete the work individually:

View Answer

Correct choice: B

Explanation:

A + B = C + D | | | | Ratio of efficiency 10x + 5x 9x + 6x |________| |_________| 15x 15x Therefore , ratio of efficiency of A:C =10:9 Therefore, ratio of days taken by A:C = 9:10 Therefore, number of days taken by A = 18 days
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