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Given that one of the five numbers is 15 and the average of the other four numbers is 14, the sum of these five numbers is______ ．
∵ one of the five numbers is 15, and the average of the other four numbers is 14. The sum of these five numbers is: 15 + 4 × 14 = 71
The average number of application questions before 4:10 p.m. ah! 1, an examination, a, B, C three average score of 91, B, C, d three average score of 89, a, D two
The average score is 95. How many points does Jia and Ding get?
2. A, B, C, D four people weigh, B, C, d three people a total of 126 kg, C, D two people average weight of 40 kg, four people average weight?
3. There are 6 students in group A and 160 students in group B. how many people are there in group B?
4. There are two cotton fields with an average yield of 92.5 kg per hectare. It is known that a piece of land has an average yield of 85 kg per hectare. How many hectares is this piece of land?
5. The average of three numbers is 2. If one of the numbers is changed to 4, the average will become 3. What is the changed number?
6. The average score of a, B, C and D in the exam was 90, but when a copied the score, he copied his own score into 87, so he calculated that the average score of the four was 88. How many points did a get in the exam?
7. The average score of Xiaoming's math test a few days ago was 84. This time, he had to test 100 points to raise his average score to 86. How many tests is this?
8. The teacher took the students to make flowers. The teacher made 21 flowers, and each student made 5 flowers on average. If the teachers and students make 7 flowers on average, how many students are there?
9. The average age of a, B and C is 22, the average age of B and C is 18, and the average age of B and C is 25. How old is B?
10. The average score of the ten contestants is 82. The average score of the first six contestants is 83. The average score of the last six contestants is 80. The average score of the fifth and sixth contestants is? No! Please bring the process with you when you write it. Write it clearly!
Please write down the question clearly when you ask next time: 1, (a + B + C) / 3 = 91 (B + C + D) / 3 = 89 get (a + B + C) - (B + C + D) = 91 * 3-89 * 3 know (A-D) = 6, because (a + D) = 95 * 2 get a = 98, B = 922, the entry condition of this question is incomplete. 3, the entry condition of this question is not complete
1. The average score of a, B and C is 91, that of B, C and D is 89, and that of a and D is 95
The average price of Grade A and grade B sugar is 7 yuan per kilogram. The average price of grade a sugar is 4 kg, 8 yuan per kilogram. The average price of grade B sugar is 2 kg, how much yuan per kilogram?
Xiaolanghua 998, Hello, a test, a, B, C three average score of 91 points, B, C, d three average score of 89 points, a, D two average score of 95 points. Question: A, d each how many points? B and C total score is: (91 × 3 + 89 × 3-95 × 2) △ 2 = 175 (points) a score is: 91 × 3-175 = 98 (points) B score
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- 1. A test, a, B, C average score of 91 points, B, C, D average of 89 points, a, D average of 95 points. A, d each score A, B, C three groups of students to plant trees, a, B two groups average of 18 trees per group, a, C two groups average of 17 trees per group, B, C two groups average of 19 trees per group
- 2. Math problem (100 points)! Solution equation: 20 + 10% x = 80 2x + 30% x = 9.215 + 10% x = 18 A machine tool factory planned to produce 20 machine tools in February, and actually produced 30, which was more than planned A.60% B 50 % C20% D33% In February, a machine tool factory planned to produce 20 machine tools, 30 more than planned, and () A60% B50% C20% D150% more than planned Mingming deposits 200 yuan of new year's money in the bank and withdraws it as a whole for one year. The annual interest rate is 2.52%. When it matures, the interest is () yuan A200 B205.04 C504 D10.08 Multiple choice questions please write how to find out, recently to test, so want to be familiar with, test good will write
- 3. Ten words? Hurry up and give me an early warning
- 4. The number 30 40 50 80?
- 5. 10 to 20 and 30, 40, 50, 60, 70, 80, 90
- 6. Subtract 80 from each data in a group of data to get a new group of data. If the average of the new group of data is 1.2 and the variance is 4.4, then the average and variance of the original group of data are______ And______ ．
- 7. Definition of variance? How does a group of data multiply or divide by a number change its mean and variance? Add or subtract a number Master help it, dead teacher did not say let us do
- 8. There is a column of numbers. The first number is 105 and the second number is 85. Starting from the third number, each number is the average of the two numbers before it. Then the integer part of the number 2011 is______ ．
- 9. Calculate the mean, median and mode of the following groups respectively. 10, 20, 80, 40, 30, 90, 50, 40, 50, 40
- 10. What is the average, median and mode of the data of 70, 0, 80, 3, 65, 4, 78, 70, 72, 68 and 70?
- 11. There are 35 kilograms of milk sugar, 10.3 yuan per kilogram, and 65 kilograms of fruit sugar, 8.5 yuan per kilogram. Mix these two kinds of sugar to make assorted sugar. At least how much yuan per kilogram can you sell without losing money?
- 12. What are the characteristics and differences of average, median and mode
- 13. Mathematical problems about mean and median Number: 1 1 2 4 2 3 Annual profit (10000 yuan / person) 2052.52.11.51.51.2 What is the average and median annual profit per person of the company? Quick! Seek the expert solution! Good Bonus!
- 14. Xiaomei is 8 years old and her father is 36 years old. When Xiaomei was how old, her father was three times as old as Xiaomei Equations to be listed
- 15. In the 13th century, Italian mathematician Leonard raised the following interesting question: if each pair of big rabbits gives birth to a pair of little rabbits every month, and each pair of little rabbits becomes big rabbits after growing for a month, and all rabbits survive, how many pairs of little rabbits will there be after a year when someone raises a pair of newborn rabbits? It's better to have a formula. Why do you do it like this?
- 16. A, B and C are three stations on the same road. The distance from station B to station a and C is equal. Xiaoqiang and Xiaoming start from station a and C at the same time and face each other. Xiaoqiang meets Xiaoming 100 meters after station B, and then they go on. Xiaoqiang returns to station C, and overtakes Xiaoming 300 meters after station B. question: what's the distance between station a and station B? Do you know how to solve this problem
- 17. A passenger car and a freight car leave from ab at the same time and run in opposite directions. The distance between AB and ab is 825km. Five hours after the two cars meet, the passenger car arrives at B. seven and two hours after the two cars meet, the freight car arrives at a. how many kilometers does the passenger car travel per hour?
- 18. A and C start from a and B in the same direction at the same time. 24 minutes after a passes B, a catches up with B. at this time, C just walks to B, and B returns immediately. A and C keep the same direction and continue to walk. When B and C meet, a returns immediately. B and C keep the same direction and continue to walk. After another 36 minutes, a and C meet at 3 kilometers away from B, then B has already walked to a__ Km away
- 19. The distance between a and B is 24 km. The fast and slow trains are both from a to B. when the fast train leaves, the slow train has already run for 4 km. When the fast train arrives at B, the slow train is 2 km away from B. how far is the fast train from B to catch up with the slow train? When the fast train runs 24 km, the slow train actually runs 24-4-2 = 18 (km), that is, the fast train runs 6 (km) more than the slow train. After that, I don't know how to do it,
- 20. 1. When the student asked the teacher how old he was, the teacher said, "when I was your age, you were just 3 years old; when you were my age, I was 39 years old." so how old is the teacher? 2. Yaya, Benben and LeLe have 73 pieces of sugar. If Yaya eats 3 pieces, Benben and Yaya have the same amount of sugar. If Benben gives Lele 2 pieces of sugar, Lele's sugar is twice as much as Benben's. how many pieces of sugar do they have? 3. There are two pieces of land with a total area of 80 hectares. Three times of the first piece of land is 10 hectares less than two times of the second piece of land. How many hectares are there in each of the two pieces of land? 4. This year, my grandfather's age is six times that of xiaolingmei. A few years later, my grandfather's age is five times that of xiaolingmei. A few years later, my grandfather's age is four times that of xiaolingmei. Q: how old is my grandfather?