Analysis: Since the price of 1 ancient poetry reading books is equal to two one-stop learning links, the seven ancient poetry reading books bought by Mr. Wang Can are converted into 2*7= 14 one-stop learning links. You can find out the unit price of one-stop learning first, and then find out the unit price of ancient poetry readers. The book bought by Teacher Wang is equivalent to 4+2*7= 18 (this book), so the price of 1 learning a little link is 85.5/ 18=4.75 yuan, and the unit price of ancient poetry reading books is 4.75*2=9.5 yuan.
There are several chickens and rabbits in the same cage. There are 30 heads in the cage and 70 feet at the bottom. How many chickens and rabbits are there in this cage?
Analysis: Assuming all chickens, the number of feet of 30 chickens should be 2*30=60 (one), which is 70-60= 10 (one) less than the condition in the title. Because each chicken is two feet less than the rabbit, the missing 10 foot will be 10/2 =. You can also assume that all rabbits are rabbits and count the number of chickens.
Option 1: suppose all chickens.
Number of rabbits: (70-2*30)/(4-2)=5 (only)
Number of chickens: 30-5=25 (only)
Option 2: Suppose all rabbits.
Number of chickens: (4*30-70)/(4-2)=25 (only)
Number of rabbits: 30-25=5 (only)
Wang Jie. All three boys in Zhangjiang have a sister. Six people play badminton together and hold mixed doubles. It is agreed in advance that brother and sister should not be partners. The first set of Wang Jie and Xiaoli versus Zhangjiang and Xiaoying. In the second episode, Zhang Jiang and Xiao Hong are the sisters of Wang Jie and Qiao Bo. Who are the sisters of Xiaoli, Xiaohong and Xiaoying?
Analysis of thinking: According to "Brothers and sisters don't communicate", analyze the situation of two couples in Zhangjiang: 1 Zhangjiang associates with Xiaoying and Xiaohong respectively in the two groups, but never with Xiaoli, so Xiaoli is Zhangjiang's sister. 2. In the second set, Zhang Jiang partnered with Xiaohong, and Wang Jie could only partner with Xiaoying or Xiaoli. Now it is known that Xiaoli is Zhangjiang's sister, not Qiao Bo's, so we know that Qiao Bo's sister is Xiaoying. The remaining Xiaohong is Wang Jie's sister.
Answer: Xiaoli is Zhangjiang's sister, Xiaohong is Wang Jie's sister, and Xiaoying is Qiao Bo's sister.
Xiao Ming got an average score of 96 in Chinese and English, and 93 in math. What is Xiao Ming's average score in Chinese, English and Mathematics?
Train of thought analysis: according to the meaning of the question, if you want an average score of three subjects, you must know what the total score of these three subjects is. Although we don't know the individual scores of each subject in the question, we can know that the average score of Chinese and English is 96*2= 192, and mathematics is the total score.
Solution: 1 The total score of Chinese and English subjects is 96*2= 192.
2 The total score of Mathematics Chinese English 192+93=285.
The average score of three subjects is 285/3=95.
Comprehensive formula (96*2+93)/3=95 (minutes)