There are 34 players playing on the 12 table tennis tables, so how many doubles players are there?

Each table can be played by 4 people or 2 people. Then, the number of tables played by 4 people is x, and the number of tables played by 2 people is y, and there are 12 tables in total, so the equation can be given: x+y=12

The number of doubles is 4x, the number of singles is 2y, and according to the total number of players, the second equation can be listed: 4x+2y=34

Solve the system of equations to obtain: x=5, y=7

So, the number of doubles is 20.

Doubles is 20 names. There are 4 players on a doubles table and 2 players on a singles table. Let the tables for doubles be x and the tables for singles be y.

x+y=12

4x+2y=34

Solve this system of binary linear equations. x=5，y=7。

So the number of players in doubles is equal to 5*4=20.

Set 12 sets all for singles, 10 more people, 10 2 = 5, 5 doubles, doubles 5 * 4 = 20 people.

There are 20 doubles.

Column 2 yuan equation, singles x stage, double play y platform.

x+y=12

2*x+4*y=34

To solve the equation, y=5, the number of doubles is 5*4=20

x+y=12

2x+4y=34

Solution: y=5, then x=7, then there are 5*4=20 doubles players.

There are 3 table tennis tables for singles and 7 table tennis tables for doubles. 3+7=10 tables. 3 2 + 7 4 = 6 + 28 = 34 students. That's right.

A total of 34 people were playing on the 12 table tennis tables, 7 in singles and 5 in doubles.

Analysis: Use the idea of chickens and rabbits in the same cage.

The first solution: Assuming that they are all playing singles, then there should be 12 2 = 24 players in front of the fierce and 34-24 = 10 players more.

To change singles to doubles, you need to add 2 people to each table, so if there are 10 (4-2)=5 tables for doubles, then there will be 12-5=7 tables for singles.

The second solution: Assuming that all 12 cards are doubles, the number of people is: 12 4 = 48 (people), which is 48-34 = 14 (people) more than the known number.

It is known that there are 4-2=2 (people) more doubles than singles, so there are: 14 2=7 (sheets) for singles, and 12-7=5 (sheets) for doubles.

A total of 34 people are playing on the 12 table tennis rackets, and how many are there in singles and doubles?

Singles: Cover Hyo-hyun (12 4-34) (4-2) = 7 sheets.

Doubles: 12-7 = 5 cards.

1.The method of using chickens and rabbits in the same cage chain to question the source of the eggplant.

2.If there are x cards for singles, then there are (12-x) cards for doubles, and 2x+4(12-x) 34

4-2）x＝48-34

2x Hail 14

x 7 doubles: 12-7 = 5

Dear, hello, I am glad to answer for you: There are a total of 34 students on the ten table tennis tables, how many table tennis tables are there in the singles and doubles? Answer: Let the number of tables in the singles be x, and the number of tables in the doubles is, 2x+4y=34x=7, y=5

You assume! 12 sets are all singles, that is, 12x2 = 2434-24 = 10, doubles is 2 more than singles, 10 2 = 5, and the conclusion is that 5 doubles 12-5 = 77 singles.

The problem is similar to that of chickens and rabbits in the same cage.

Subtract 2 people per table, 34-12*2=10

The rest are the people on the table where the doubles are played. 10 2 = 5 tables.

Singles is 12-5 = 7 tables.

Use the equation: Let the table x for singles and the table y for doubles, x+y=12

2x+4y=34

Solving the equation yields 7 singles and 5 doubles.

Singles: (12 4- 34) (4- 2) = 7 (sheets).

Doubles: 12-7 = 5 cards.

5 doubles and 7 singles.

7 in singles and 5 in doubles. Do you know??? 250！

Hello, we are happy to provide you with professional answers

Provide you with three ways to solve the problem, for your reference:

1. Equation method.

If there are x tables for singles, then there are 12-x tables for doubles and the equations are listed according to the title:

2x+4×(12-x)=34

Solution: x=7, then 12-x=5

There are 7 tables for singles and 5 tables for doubles.

2. Arithmetic.

Number of tables for singles = (4 12-34) (4-2) = 7 Number of tables for doubles = (34-2 12) (4-2) = 53, hypothetical method.

There are 12 tables all for singles.

Then there are 12 2 = 24 people playing table tennis.

And there were actually 34 people.

The difference is 34-24=10 people.

There are 10 (4-2) = 5 tables for doubles.

There are 12-5 = 7 tables for singles.

There are x tables for singles and y tables for doubles;

So: (1) x + y = 12

Again: 2 players each time in singles, 4 players in doubles each time;

2）2x+4y=34

1) Equation x=12-y is substituted into equation (2).

2×（12-y)+4y=34

24-2y+4y=34 (shift).

2y=10y=5 (number of doubles).

Substituting y=5 into equation (1).

x+5=12

x = 7 (number of tables for singles).

It can be assumed that the doubles practice is x tables, and the singles practice is y tables, then x+y=12; Because doubles is a table for 4 people and singles is a table for 2 people, so 4x+2y=34

That is: x+y=12 x=12-y4x+2y=34

4*(12-y)+2y=34 48-4y+2y=342y=14 y=7 x=12-7=5 So there are 5 tables for practicing doubles and 7 tables for practicing singles.

Assuming that 10 table tennis tables are all singles, then 10 2 = 20 people, and the actual 36 people play, the actual 36-20 = 16 more than the assumption, this is because each doubles table is 4-2 = 2 more than each singles table The number of doubles table tennis tables can be found accordingly, and then 10 is used to subtract, which is the number of singles table tennis tables, and the answer is accordingly.

This question tests the student's logical reasoning ability, this question belongs to the chicken-rabbit cage problem, the key to solving this kind of problem is to use the hypothetical method to analyze, each doubles table is more than each singles 4-2=2 people is the breakthrough point of this problem.

Solution: (36-10 2) (4-2).

8 (sheets) 10-8 = (2 sheets).

A: There are 2 table tennis tables for singles and 8 table tennis tables for doubles

There are x singles tables and Y doubles tables.

Equation: x+y=10

2x+4y=36

Solution: x=2 y=8

So, 2 singles tables and 8 doubles tables.