ISEE Quantitative Comparisons Question 93: Answer and Explanation
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Question: 93
| A can do a job alone in 4 days. B can do a job alone in 3 days. | |
| Column A | Column B |
| The number of days it takes A and B working together to do the job | 2 days |
- A. if the quantity in Column A is greater
- B. if the quantity in Column B is greater
- C. if the quantities are equal
- D. if the relationship cannot be determined from the information given
Correct Answer: B
Explanation:
The correct answer is (B). Let x = the number of days A and B take working together.
A can do the job in 4 days; thus, A's rate is 
.
B can do the job in 3 days; thus, B's rate is 
.
2 days > 1
days
Column B > Column A