Math puzzle: knockout
Topic elimination tournament
Eight little boys together are better than anyone else, and everyone says they are the best. Then an old gentleman came up and said, stop arguing. Let's use the elimination system. Two people wrestle in pairs, and one person is eliminated in each game. Finally, the champion is decided, that is, the most powerful person. ? Everyone is unanimously in favor. The old man said again:? How many more fights will there be like this? You do the math, you do the math, and I'll be the referee. ? Son, can you work it out?
Answer:
A * * * will play seven games.
Math puzzle: Apple
Apple
Xiao Qiang and Xiaoming each have 10 apples, and Xiaoming gave Xiao Qiang two apples. How many more apples are there in Xiao Qiang than in Xiaoming?
Answer:
(Methods 1) 10+2= 12 (pieces), 10-2=8 (pieces), 12-8=4 (pieces).
Math puzzle: folding plane
Title folding plane
It takes three minutes for a child to fold a plane. There are five children now. How many minutes does it take to fold five identical paper planes at the same speed?
Answer:
It takes three minutes.
Mathematical puzzles: ancient coins
Ancient coins
Boss Yu bought two ancient coins and later sold them at the price of each 60 yuan. One of them made 20% and the other lost 20%. I want to ask: compared with the two ancient coins he bought at the beginning, is boss Yu a winner or a loser, or just the same?
Math Puzzle: Gift Shop
Theme gift shop