The original choir had 325 students. If there are 25 more boys and 5% fewer girls, the choir will have 34 1 student. Former choir student.
3. Class A has 5 1 and Class B has 49 students. The average score of two classes in one exam is 8 1, and the average score of Class B is 7 points higher than that of Class A. Then, the average score of Class B is.
4. Party A, Party B and Party C plant trees. The number of trees of Party A is the sum of Party B and Party C, and the number of trees of Party B is the sum of Party A and Party C. It is known that Party C planted 65,438+030 trees, so Party A planted trees.
There are two classes, Class A and Class B. The number of students in Class A is Class B. If three students are transferred from Class B to Class A, the number of students in Class A is Class B, and Class A has the original students.
6. Starting from 5: 00, the minute hand and the hour hand are at right angles for the first time and the second time.
7. Mr. Wang has a watch, which is 4 minutes faster than the standard time every hour. He set his watch for 6 o'clock in the morning. When the watch points to 10:, the standard time is hours and minutes.
79. 1 194 School teachers and students went out to visit. It is planned to distribute 2 bottles of soft drinks to each person, and the price of each tinea soft drink is 1.8 yuan. The store stipulates that every six empty soda bottles can be changed 1 bottle. The teacher led the team to make a reasonable plan, recycle empty bottles for soda, and let everyone drink soda in a planned way, saving Yuan.
8. Fill in the following formula with eight numbers: 2, 4, 6, 8, 10, 12, 14, 16. Each number can only be filled in once, so the minimum value of the calculation result is and the maximum value is.
□×□+□×□×□+□×□×□
9, a rectangle, if the length is reduced by 5 cm and the width is reduced by 2 cm, then the area will be reduced by 66 square cm. At this time, the remaining part happens to be a square, so the area of the original rectangle is square centimeters.
Mingming, Dongdong, Lanlan, Jingjing, Sisi and Mao Mao attended the party. When meeting, every two people shake hands. Yao shook hands five times, Dongdong shook hands four times, Light Light Blue shook hands three times, quietly shook hands twice, Sisi shook hands once and Mao Mao shook hands twice.
1 1, A, B, C and D participate in the 800-meter race. After the game, they said their respective rankings:
A said: C first, I second;
B said: I am the first, and Ding is the third;
C said: B second, I fourth;
Ding didn't speak.
Actually, A, B and C are only half right, so the order from first to fourth is.
12, with serial numbers: 1, 1, 2, 3, 5, 8, 13, 2 1, 34, 55, 89, ... Its formation law is: the first two numbers are/. The fourth number is equal to the sum of the second and third numbers:1+2 = 3; The fifth number equals the sum of the third and fourth numbers: 2+3 = 5; The sixth number is equal to the sum of the fourth and third numbers: 3+5 = 8; ..... and so on. Then the remainder of the number 2007 divided by 7 in this column is.
13, with 2007 students, number 1 ~ 2007. After they are arranged in a circle clockwise according to the numbering sequence, they report to 1 in a clockwise cycle starting from the classmate with the number 1. Then the last classmate's number is.
14, natural number 1, 2, 3, 4, 5… are arranged in sequence, and the multiples of 2 and 3 are crossed out, but the multiples of 7 are kept, and the remainder of 2007 is.
16. Fill in one of "+","-",× "and ÷ in the following formula to form a formula, and the operation result A*** has different values.
6□3□2=A
17. In a football round robin, the winner scored 3 points, the draw scored 1 point, and the loser scored 0 point. As a result, the champion team won the least times, but scored the highest. Then the champion team will score at least 10.
18. There are two barbers in the barber shop and five customers come at the same time. According to their requirements, it takes 20, 12, 10, 24 and 15 minutes respectively. How to arrange for them to get a haircut, so as to minimize the total waiting time for five people to get a haircut? What is the total minimum time?
19. In the addition formula shown in figure 1, each Chinese character represents a number from 1 to 9, the same Chinese character represents the same number, and different Chinese characters represent different numbers, so the sum of this addition formula is.
I like the Hope Cup math contest.
+ 8 6 4 1 9 7 5 3 2
I hope you love me.
20. The sum of four nonzero natural numbers is 38. The minimum value of the product of these four natural numbers is, and the maximum value is.