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Fourth grade, draw inferences from others. Seek a detailed explanation.
It takes 4 minutes to fry a cake, which means it takes 2 minutes to cut one side.

You can put two cakes at a time, that is, bake two cakes on one side for 2 minutes.

Frying 2004 cakes takes 2004 times. (In 2004, one page was ***4008, with two sides at a time, so it was used 2004 times. )

2004 * 2 = 4008 (minutes)