There are four classes in grade six. There are 84 students in class one and class two, and 136 students in class two and class three

84+136=220

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1. There are four classes in grade six. There are 84 students in class one and class two. There are 136 students in class two and class three,
2. There are four classes in grade six, 82 students in class one and class two, 84 students in class two and class three, 86 students in class three and class four, and () a: 82 students in class four and class one, B: 84 students in class one, C: 86 students in class two and class three, D: 88 students in class four and class one
3. There are 84 students in class one and class two, and 136 students in class two and class three? Please review the topic
4. There are four classes in Grade 6, 84 students in class 1 and class 2, 136 students in class 2 and class 3. Class 2 accounts for 25% of the whole grade, best Don't use equations
5. The sixth grade students of an experimental primary school are divided into three groups to participate in tree planting activities. The number ratio of the first group and the second group is 5:4, and the number ratio of the second group and the third group is 3:2 It is known that the number of people in the first group is 15 less than that in the second and third groups. How many people participated in tree planting?
6. The task of 576 trees was assigned to each class according to the number of three classes in Grade 6. There were 47 students in class 6.1, 48 students in class 6.2 and 49 students in class 6.3,
7. There are 84 girls in the sixth grade of experimental primary school, and the number of boys is 1 / 4 more than that of girls. The number of sixth grade students accounts for 7 / 36 of the total number of students in the school. How many students are there in the school?
8. Simplification ratio 0.4:1 / 4 (quarter) 3 tons: 250 kg Simplification ratio
9. 3: 60.78: 9.5 ha: 5700 M2 01 = 1 / 2 = 1 / 3
10. 3:4:2:10.5:2.6 8:7:0.5 4:3:0.8 There must be a formula 3 / 4: 1 / 2 0.5：2.6 7 / 8: 0.5 3 / 4: 0.8
11. The school allocated 536 books to each class according to the number of three classes in Grade 6. There are 45 students in class 1, 42 students in class 2 and 47 students in class 3. Each class should get more books There is another question that I hope primary schools can participate in tree planting activities. The ratio of trees planted in grade 4, 5 and 6 is 2:3:4. It is known that there are 84 more trees planted in Grade 6 than in grade 4. How many trees are planted in grade 4, 5 and 6?
12. The school allocated 524 books to each class according to the ratio of three classes in Grade 6. There were 42 students in class 1, 45 students in class 2 and 44 students in class 3. How many books should each class get?
13. Some books are distributed according to the ratio of the number of students in three classes in grade six. There are 42 students in class one, 45 students in class two and 44 students in class three. Class two gets six more books than class one. How many books are there in all
14. 1. The school lends 780 books to each class according to the ratio of the number of students in three classes of grade 6. There are 43 students in class 1, 42 students in class 2 and 45 students in class 3. How many books can each class borrow? 2. The perimeter of a rectangle is 5.6CM, and the ratio of length to width is 5:2. How many square centimeters is its area?
15. The school divided 264 books into three classes in Grade 6, with 42 students in class 1, 46 students in class 2 and 44 students in class 3. How fair is the division? How many books are each divided into three classes
16. （1）23°30′=（）（2)13.6°=——°——′（3）52°32′-34°37′=( ) (4)38°43′+27°36′=——
17. For the formula 2 (3 + 1) (32 + 1) (34 + 1) (38 + 1) (316 + 1) (332 + 1) + 1, do you know the number of digits it calculates
18. How many digits is the result of formula 2 (3 + 1) (32 + 1) (34 + 1) (38 + 1) (316 + 1) (332 + 1) + 1?
19. There are three classes in Grade 6 contributing to the hope project. Class 6 (1) contributes 13% of the total. The ratio of class 6 (2) to class 6 (3) is 3:5. It is known that class 6 (3) donates 150 yuan more than Class 6 (1). How much is the total donation of the whole grade?
20. Class A, class B and class C donated books to the hope project. It is known that one person in class a donated 6 books, two people donated 7 books each, and the others donated 11 books each; one person in class B donated 6 books, three people donated 8 books each, and the others donated 10 books each; two people in class C donated 4 books each, six people donated 7 books each, and the others donated 9 books each How many students are there in each of the three classes?