The number of trees planted by the students of three classes in Grade 6 of experimental primary school is 2 / 5 of that of class C and 3 / 4 of that of class A. the number of trees planted by class A is 5 of that of class B 4. How many trees will be planted in class C and 150 in class B?

A 150 × 4 / 5 = 120 trees
B 120 × 3 / 4 △ 2 / 5 = 225 trees

There are 300 trees planted in four classes in Grade 6 of experimental primary school. The number of trees planted in class 61 is known, which is one fourth of the total trees planted in the other three classes. How many trees are planted in class 61

Can we solve it by equation?
If there are x trees planted in class 61, there are 4x trees planted in the other three classes
x+4x=300
5x=300
x=60
A: Sixty trees were planted in class 61

Four students went to plant trees. The first student planted 12 trees, the second 14 trees, the third 15 trees, and the fourth 15 trees. How many trees did the four students plant?

15 (1-11 + 2-11 + 4-11 + 5) = 15 (1-13-15-16) = 15 (310) = 15 × 103 = 50 (trees) a: the four students planted 50 trees

Four students planted 120 trees. The first student planted one tree, which is half of the total number of other students. The second student planted one tree, which was planted by other students
One third of the total trees, the third student planted one fourth of the others, and how many trees did the fourth student plant?

Because the first student is half of the total number of other students, so the first student should be planted 1 / 3 of the total number, that is 40. Similarly, the second student planted 1 / 4 of the total number, that is 30, the third student planted 1 / 5 of the total number, that is 24, then the fourth student planted: 120-40-30-24 = 26, very happy for

The number of trees planted by the students of three classes in Grade 6 of experimental primary school is 2 / 5 of that of class C and 3 / 4 of that of class A. the number of trees planted by class A is 5 of that of class B 4. How many trees will be planted in class C and 150 in class B?