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fourteenstix
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6 machines working at a constant rate can complete a job in 12 days. How many additional machines working at the same constant rate are needed to complete the job in 8 days?
A) 2
B) 3
C) 4
D) 6
E) 8
If 6 machines take 12 days to complete the job, then we can say that the job takes 72 "machine days" to complete the job (6x12=72)
To complete the job in 8 days would require 9 machines (72 machine days divided by 8)
So, we need an additional 3 machines.
Answer = B
Cheers,
Brent
