1. Scissors, stone cloth, scissors and stone cloth must be 10 at least, so there must be four times. Technology: 3*3+ 1

Let each child have two yuan, which is 60 yuan. So even if you have 60 yuan, you don't necessarily have three children. Add one more, no matter who you give it to, your friends will have three pieces, so prepare 6 1 piece.

3. Six 1*5+ 1 =6. If you take five, the colors may be different. If you take another picture, it will be the same as the original five. If there must be three colors, 1 1. Because if you take 10, there may be only two colors. Take another one.

If you want to take out two pairs of chopsticks with different colors, you must take at least 9 pairs (maybe 8 times).

If you want to take out two pairs of chopsticks with the same color, you must take at least four pairs of chopsticks (you can take three pairs of chopsticks with different colors)

Satisfied, please adopt doubts and ask me.