Question

In a school, students thought of planting trees in and around the school. It was decided that the number of trees that each section of each class will plant will be the same as the class in which they are studying
E:g a section of class 1 will plant 1 tree, a section of class 2will plant 2 tree's &class 3 will plant 3 trees so on 7 there are 3 section of each class. How many trees will be planted by student

Answer 1

So we can use Sum formula for this

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Answer 2

HELLO FRIEND,
as there are 3 sections of each class, so
plants grown by class 1 - 1+1+1 = 3
plants grown by class 2 - 2+2+2 = 6
plants grown by class 3 - 3+3+3 = 9
plants grown by class 4 - 4+4+4 = 12
plants grown by class 5 - 5+5+5 = 15
plants grown by class 6 - 6+6+6 = 18
plants grown by class 7 - 7+7+7 = 21

so, the total trees planted by the students = 3+6+9+12+15+18+21
                                                                   = 84

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