1, pancake problem: Mom bakes a cake for two minutes, one minute in front and one minute in the back, and at most two cakes are put in the pot at the same time. How many minutes does it take to bake three cakes?

2, socks problem, there are 5 pairs of socks of different colors in the drawer, and the lights are not turned on. How many socks of the same color do you need to pull out?

3, egg problem: Xiao Zhang sells eggs, a basket of eggs, the first person to buy half, Xiao Zhang to give him another, the second person to buy half, Xiao Zhang to give him another egg, the third person to buy half, Xiao Zhang to give him another, the fourth person to buy half, Xiao Zhang to give him another, eggs just bought! How many eggs has Xiao Zhang always had?

4, the table problem, a square table, how many corners are there after cutting off a corner?

5, cut tofu problem: a piece of tofu cut three knives, up to a few pieces.

6, cut watermelon problem: three knives cut 7 petals, eat the remaining 8 skins, how to cut?

7. Bamboo pole problem: Can a 5-meter-long bamboo pole pass through the door of 1 meter?

8. Paper box problem: Can a one-meter-long square box hold a 1.5m stick?

9. Clock problem: 12 hours, how many times does the clock and minute hand repeat?