Solve the problem.The time it takes to complete a certain job varies inversely as the number of people working on that job. If it takes 28 hours for 7 carpenters to frame a house, then how long will it take 42 carpenters to do the same job?
A. 4.7 hr
B. 40 hr
C. 42 hr
D. 10.5 hr
Answer: A
Mathematics
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A. 
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C. a2
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Mathematics