Answer and Explanation
Your Answer is
Correct Answer is B
Explanation
There are several bricks in each layer, so if there are 12 layers, the total number of revolutions is 1 plus 12, that is, 78. Choose B.
1. Carmen is playing with blocks. She arranges stacks of blocks so that each successive level of blocks has 1 fewer block than the level below it and the top level has 1 block. Such a stack with 3 levels is shown below. Carmen wants to make such a stack with 12 levels. How many blocks would she use to build this stack?
