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What is the regular formula of pancake problem?
If you arrange the exam according to the above method, although you can give the answer, it is still a waste of time, so I will summarize the basic formula of pancake problem for you:

Number of pancakes = (number of pancakes ×2)/ at most several pancakes at a time (number of pancakes when there is surplus+1).

Total time = OEM times × OEM time on each side.

Example 2: The copy agency needs to print 9 sheets of materials, both sides of which need to be printed. If you can print at most two at a time, how many times do you need to print at least?

A.7 times B.8 times C.9 times D. 10/0 times.

Answer C.

Analysis: This question is the deformation of the pancake problem, and the printed materials are essentially the same as pancakes. Number of pancakes = (number of pancakes ×2)/ How many pancakes to eat at a time = (9 * 2)/2 = 9 times, so choose C.

Example 3: The whole class held a party to welcome the New Year. The class asked the canteen chef to bake a cake for 26 students, 26 parents and 1 teacher. If the pot can bake three cakes at a time, both sides of the cakes should be baked for 2 minutes, how many minutes should the canteen master bake at least?

A.70 times B.72 times C.74 times D.76 times

Answer B.

Analysis: The canteen master baked a cake for 26 students, 26 parents and 1 teacher in the class, and * * * needed to bake 26+26+ 1 = 53 cakes. According to the formula, the number of pancakes = (number of pancakes ×2)/ how many pancakes to eat at a time = (53 * 2)/3 = 35... 1, so it needs to be baked 35+ 1=36 times. Bake for 2 minutes each time, * * * 2×36 = 72 minutes.