Arithmetic Aptitude Time and Work

• A 12
• B 15
• C 9
• D 6
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D

Answer: D

If the work rate of A is 1/x of the task per day,
the work rate of B is 1/x of the task per day, and the work rate of C is 1/x of the task per day,
then the combined work rate of A, B, and C is
(1/x + 1/x + 1/x) of the task per day, which is equal to 1/2 of the task per day.
Therefore, x = 12, which means that B takes 6 days to complete the task on their own

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