The outstanding performance of China delegation in men's singles U-pool in this year's Winter Olympics is a big black horse. China's Zhang Yiwei slipped out of the preliminaries with a high score of 90 points, and even ranked sixth in the final, which made people shine. Seeing that I was so excited, my mother asked me a question: "After a snowboarder finished skiing, six judges A got 8 1, B got 89, C got 83, D got 88, and E got neither the best nor the worst." E How many points must I take to ensure that the average score is above 85? " (Remove the best and worst results when calculating) "
This question really bothers me. I thought it over and over again, but I didn't have a clear idea. My mother gave me a hint: "If you get rid of the best and worst grades first, will it be much clearer?" I wrote the rest of the figures on paper, and suddenly it dawned on me: "If the average score is above 85, then the total score of three people should be 85*3, and the result is equal to 255. If 255-83-88=84, the score of the fourth judge is 84! "
Mom nodded and said, "Congratulations on getting it right, but the next question will be more difficult. A got 79 points, B got 88 points, C was more than D 1 point, D was more than E, and the final average score was 84 points. AB is the highest score and the lowest score. How many points did CDE get respectively? "
I thought about it and got their total score of 83*3=252. I suddenly remembered the difference between the sum and the difference in the previous Olympic math class. If I take all three numbers as e, the total score becomes 252-4-( 1+4)=243, and then 243 divided by 3 equals 8 1, and then 81+4 = 85,85+65433. My mind suddenly became clear: "86 points, d 85 points, E 8 1 point." Mom smiled and nodded: "You passed the exam successfully! You can get rid of the Olympic math problem today! " "Oh, yes!" I can't help cheering.
Mathematics is everywhere in life. As long as we observe carefully and think seriously, we will be able to solve one difficult problem after another in life.