Sixth grade math Olympiad questions, help solve them, thank you

Question 1: 2.

Process: Originally, the number of girls was 36 * (4 9) = 16.

Suppose x girls come, according to the title, there is the following relationship.

36+x）*9/19=16+x

From this equation we get x=2

Question 2: 120 pages.

Assuming that Xiao Ming reads x pages a day, the total number of pages in the book is 3x+66, according to the title.

3x+66)*2/5=66-x

If the solution is x=18, then the book has 18*3+66=120 pages.

Question 3 The first bucket is 26, and the second bucket is 18

Steps: Let's say the first bucket is filled with x kilograms, and the second barrel is 44-x kilograms.

From the meaning of the title, (4 5) x = 44-x+

Solving this equation gives x=26, and the other bucket is 44-26=18

Boys remain the same, there are: 36 (1-4 9) = 20 people.

Later total: 20 (1-9 19) = 38.

Girls again: 38-36 = 2 people.

Those who read the whole book every day: (1-2 5) 4=3 203 days, and those who read the whole book: 3 20 3=9 20

Total: 66 (1-9 20) = 120 pages.

According to the title, the second barrel is less than the first barrel of 1-1 5 = 4 5 kilograms.

First barrel: (44+ kg.)

Second barrel: 44-26 = 18 kg.

1.Counting the number of girls '36x4 9' gives 16 people, and the boys are 20 people. At this time, several girls came to read the book, accounting for 9 19 of all the readers, and the boys accounted for 10 19, and 20 was divided by 10 19 to get the total number of 38 at this time, and the original number of 36 was subtracted to get 2, indicating that 2 girls came later.

36x4/9=16，36-16=20，1-9/19=10/19，20*10/19=38，38-36=2

A.........ok

2.I watched a total of 3 5 in four days

3 20 a day

Three days to see 9 20

There are 11 20 unseen

According to the title, the second barrel is less than the first barrel of 1-1 5 = 4 5 kilograms.

First barrel: (44+ kg.)

Second barrel: 44-26 = 18 kg.

1. Suppose x girls came later, 9:19=(36*4 9+x):(36+x) solution x=2

2. Let the book have x pages, and the speed of reading is certain, (x-66): 3=(x-2 5x): 4 solution x=120

3. Let the first barrel be filled with x kilograms, and the second barrel should be filled with (44-x) kilograms, x-1 5x=44-x+

Solved x = 26, the second barrel contained 18 kg.

Xiao Yao Ruyi's dog.

If you don't give it to him, you curse.

Dare to scold our sad sister.

1. (1+1 2) (1-1 3)=9 4 tons.

2. If the first basket has x apples, then the second basket has 50-x, then (1-1 3)x=()1 2x(50-x)x2; The solution is x=30, 50-x=50-30=20.

3. Lower grades: middle grades = (1 + 1 4): 4 5 = 25:16; Middle Grade: Upper Grade = 4 3:3 4 = 16:9. So.

Lower Grade: Intermediate Grade: Upper Grade = 25:

16:9, i.e. the number of lower grades is 25 to 16 of the middle grades;The number of senior students is 9 to 16 in the middle grade. If there are 2000 students in the whole school, there are 2000x25 (25+16+9)=1000 students in the lower grades; 2000x16 50=640 in the middle grade; There are 2000x9 50 = 360 in the upper grades.

4. At this time, Xiao Ming has 50x7 10 = 35 sheets, Xiao Hong has 50x3 10 = 15 sheets, and Xiao Ming has (50-15 1 2) (1-1 3) = 30 sheets; Xiaohong's original 50-30 = 20 sheets.

5. (72+20) (1-1 3-3 5) = 1380 people.

6. If this bag of rice has x catties, then (x-6)x4 11+1 2x+6=x; Solution x=28

Solve the six questions first. Let's talk about the rest.

1 divided by 1/2 in divided by 1/3