In a school,student thought of planting trees in and around the school to reduce air pollution.It was decided a section of class 1 will plant 1 tree,a section of class 2 will plant 3 trees,a section of class 3 will plant 5 trees and so on till class 12.
On the basis of above information,answer the following questions:-
1.How many trees will be planted by class 9 ?
a.9 b.11 c.17 d.20
2.which class will plant 21 trees ?
a.class 12 b.class 11 c.class 10 d.class 8
3.If there is only one section of each class,how many trees in all will be planted?
a.72 b.108 c.144 d.288
4.If each tree cost Rs 3,how much expenses will be increased?
a.Rs 634 b.Rs 432 c.Rs 324 d.Rs 216
5.How many more trees are planted by class 7 than these planted by class 4 ?
a.3 b.4 c.5 d.6
Answers
Answer:
ans.1 = 17 trees ans.2 =11 class ans.3 = 144 ans.4 = 432 ans.5 = 6 more trees
Step-by-step explanation:
class 1 = 1 tree
class 2 = 3 trees
class 3 = 5 trees
class 4 = 7 trees
class 5 = 9 trees
class 6 = 11 trees
class 7 = 13 trees
class 8 = 15 trees
class 9 = 17 trees
class 10 = 19 trees
class 11 = 21 trees
class 12 = 23 trees
in the above explanation you understand that in each class they are planting an ood number of trees so that's how we will get answers of question 1 & 2
total no. of trees = 1+3+5+7+9+11+13+15+17+19+21+23
= 144
that's how we will find the answer of question 3
total cost of tree's = 144 x 3
= Rs.432
that's how we will find the answer of question 4
class 7 = 13 trees
-
class 4 = 7 trees
6
therefore there are 6 more trees
and that's how we answer all the questions
i am sure my answer is not wrong .