A class is going to plant trees on tree planting day If each student plants 14 saplings, the remaining 20 saplings will not be planted. If each student plants 15 saplings, an additional 11 saplings will be prepared. How many students are there in this class?

A class is going to plant trees on tree planting day If each student plants 14 saplings, the remaining 20 saplings will not be planted. If each student plants 15 saplings, an additional 11 saplings will be prepared. How many students are there in this class?

There are x people. So 14x 20 equals 15x-11. So x equals 31. So there are 31 people in this class

During the tree planting Festival, students of class 6 (1) and class 6 2 took part in tree planting activities respectively. Class 6 1 Planted 40 trees and 38 survived. Class 6 2 also planted 40 trees and the result was satisfactory
36 trees survived. What's the survival rate of these seedlings?

（38+36）/(40+40)x100%
=92.5%

On the tree planting day of March 12, the school organized all the students to participate in the tree planting activities, planning to plant 1600 trees, and the trees planted in each class are the same
When planting trees, eight classes are responsible for carrying seedlings, so other classes are worth 10 more trees than originally planned. How many classes are there in this school?

There are x classes in this school
1600/x+10=1600/(x-8)
X = 40 or x = - 32 (rounding off)
There are 40 classes in this school