There are 84 students in class one and class two, and 136 students in class two and class three? Please review the topic

84 + 136 = 220 two classes 2. The number of class 1 and class 3 is 136-84 = 52. The number of class 3 is 52 more than that of class 1. Among the 220 people, in addition to class 3 and class 1, there are two classes 2. The number of class 2 is at least 220 / 2 = 110. The number of class 2 is the most

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1. 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
2. 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?
3. 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,
4. 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?
5. Simplification ratio 0.4:1 / 4 (quarter) 3 tons: 250 kg Simplification ratio
6. 3: 60.78: 9.5 ha: 5700 M2 01 = 1 / 2 = 1 / 3
7. 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
8. 0.1：0.4 16：20 0.15：3 2/3：1/2 5.6：4.2 168：84 1：0.25
9. Mathematics sixth grade volume two can be simplified to calculate two 2.7x[1÷（4.3-4.29] 1110 △ [48x (5 / 6-5 / 8)]
10. 2.56+1/9-1.56+8/9 For a batch of parts, first process 120 parts, and then process the remaining 40%. At this time, the number of processed parts is equal to the number of unprocessed parts. How many parts are there in this batch?
11. 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
12. 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,
13. 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
14. 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?
15. 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?
16. 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
17. 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?
18. 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
19. （1）23°30′=（）（2)13.6°=——°——′（3）52°32′-34°37′=( ) (4)38°43′+27°36′=——
20. 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