Discussion
Seven machines take 7 minutes to make 7 identical toys. At the same rate, how many minutes would it take for 100 machines to make 100 toys?
Answer: B
It takes 7 minutes.
Seven machines make 7 toys in 7 minutes, so each machine makes one toy in 7 minutes. A hundred machines working at the same time each make one toy in those 7 minutes, giving 100 toys.
100 and 700 come from scaling the time with the number of toys and forgetting that the number of machines grows in the same proportion. 1 minute would need each machine to work seven times faster.
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