ISEE Mathematics Achievement Question 27: Answer and Explanation
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Question: 27
13. A clerk can add 40 columns of figures an hour by using an adding machine and 20 columns of figures an hour without using an adding machine. What is the total number of hours it will take the clerk to add 200 columns of figures if 
of the work is done by machine and the rest without the machine
- A. 6 hours
- B. 7 hours
- C. 8 hours
- D. 9 hours
Correct Answer: B
Explanation:
The correct answer is (B). 
of 200 = 120 columns by machine @ 40 columns per hour = 3 hours
200 - 120 = 80 columns without machine @ 20 columns per hour = 4 hours
3 hours + 4 hours = 7 hours to complete the job.