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A and B can do a job together in 12 days. A is 2 times as efficient as B. In how many days can B alone complete the work ?
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Explanation:
Time taken by A to complete a work
= x days
Time taken by B to complete the same work
= 2x days
According to the question,
1\x+1\2x=1\12
=> 3\2x=1\12
x=3×12\2=18
Time taken by B to complete the same work = 2x=2×18=36days