Arithmetic Aptitude Time and Work

• A 12
• B 13
• C 11
• D 10
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C

Answer: C

If A can complete a task in 25 days,
and B can complete the same task in 20 days, then their combined daily rate of progress is 1/25 + 1/20 of the task per day.
Therefore, their 5 days of work together represents 5 * (1/25 + 1/20) = 9/20 of the task.
This means that the remaining work to be done is 1 - 9/20 = 11/20 of the task.
If B can complete 1/20 of the task in one day, then it will take him 11 days to complete the remaining 11/20 of the task

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