Arithmetic Aptitude Time and Work

• A 20
• B 25
• C 10
• D 15
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C

Answer: C

The work rate of X is 1/20 of the task per day, and the work rate of Y is 1/12 of the task per day. X works alone for 4 days, completing 1/5 of the task.
The remaining work is 4/5 of the task, and the combined work rate of X and Y is 2/15 of the task per day.
Therefore, it will take X and Y a total of 6 days to complete the remaining work.
The total time taken for the work to be completed is 6 days + 4 days = 10 days

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