Arithmetic Aptitude Time and Work

• A 15 days
• B 20 days
• C 25 days
• D 30 days
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C

Answer: C

If the work rate of A and B together is 1/10 of the task per day,
the work rate of C is 1/50 of the task per day,
and the combined work rate of A, B, and C is 1/6 of the task per day,
then the work rate of A is equal to the combined work rate of B and C.
Therefore, the work rate of B is (1/6 - 1/50) of the task per day,
or 1/25 of the task per day.
This means that B can complete the task in 25 days on their own

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