A pile of bricks has 61 bricks in the bottom layer, 58 bricks in the second layer, 55 bricks in the third layer and so on until there are 10 bricks in the topmost layer. How many layers are there?
A. 18
B. 19
C. 20
D. 21
pa answer po please
A. 18
B. 19
C. 20
D. 21
pa answer po please
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Answer:
There are 18 layers.
Step-by-step explanation:
10=61+(n-1)(-3)
10=61-3n+3
3n=64-10
3n=54
n=18