This machine puzzle sounds like it should require multiplication, but the machines work at the same time.
If 5 machines make 5 toys in 5 minutes, each machine makes 1 toy in 5 minutes.
So if you have 100 machines working simultaneously, each can make one toy during that same 5-minute period.
Answer: 5 minutes.
The number of machines and toys both increase together, so the required time does not change.
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