In a school, students decide to plant trees in and around the school to reduce air pollution. It was decided that the number of trees, that each section of each class will plant, will be double of the class in which they are studying. If there are 1 to 12 classes in the school and each class has two sections, find how many trees were planted by the students. (CBSE 2014)
Each class has to plant double the class they are studying
Therefore, first class will plant = 2
Second class will plant = 4
Same as, 12th class will plant = 24
Total number of plants to be planted = sum of all plants
= 
[a + l]
= 
[2 + 24]
= 6 * 26 = 156
Therefore, there are 2 sections in each class
So, total trees = 2 * 156 = 312
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