Discussion
There are 5 machines that make 5 parts in 5 minutes. How long does it take to make 100 parts in 100 machines?
Answer: A
Five machines make 5 parts in 5 minutes, so each machine makes 1 part in 5 minutes.
One hundred machines then make 100 parts in the same 5 minutes, option A. The answers 100, 50 and 30 minutes come from wrongly scaling the time with the number of parts.
The rate per machine is 1 part per 5 minutes, which does not change as more machines are added.
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