Each machine makes a widget in 5 minutes. A hundred machines working at once make a hundred widgets in the same 5 minutes. The answer that jumps out is 100.
If it takes five machines five minutes to make five widgets, how long would it take a hundred machines to make a hundred widgets?
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How long does a single machine take to make a single widget?
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5 minutes
Source: Shane Frederick, Cognitive Reflection and Decision Making, Journal of Economic Perspectives, 2005