A can do a job in 20 days, B in 10. Working together, they do how much in one day?
Correct answer: C. 3/20
- A. 1/20
- B. 1/10
- C. 3/20
- D. 1/5
Explanation
To determine the combined work rate of A and B, add their individual rates. A completes 1 job in 20 days, so A's rate is 1/20. B completes 1 job in 10 days, so B's rate is 1/10. Working together, their combined rate is 1/20 + 1/10 = 1/20 + 2/20 = 3/20. Therefore, A and B together complete 3/20 of the job in one day, making option C correct. Options A and B represent the individual rates of A and B, respectively, and option D suggests a rate that is too high for their combined effort.
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