The students of green team went to the barren mountain to plant trees. The survival rate of trees was 95%, and 20 did not survive. How many trees did the students plant? Decomposition

The students of green team went to the barren mountain to plant trees. The survival rate of trees was 95%, and 20 did not survive. How many trees did the students plant? Decomposition

twenty
--------= 400
1-95％

The green team took part in the tree planting activities. A total of 480 trees survived, and the survival rate was 96%. How many trees did the green team plant

480 △ 96% = 500 (trees)
A: the green team planted 500 trees

The number of trees planted in the first class accounts for 1 / 4 of the total number of trees planted in the three classes, and the ratio of the number of trees planted in the second class to the number of trees planted in the third class is 3:4,
Class 2 planted 24 fewer trees than Class 3. How many trees were planted in each of the three classes
/It's a semicolon, one fifth of writing

Class 2
24÷（4-3）x3
=24x3
=72 trees
Class 3
72x4 / 3 = 96 trees
altogether
（72+96）÷（1-1/4）
=168÷3/4
=224 trees
Class 1
224x1 / 4 = 56 trees
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