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Solution: How many bricks are there all together?

How many bricks are there all together?

Problem Statement: EE Board April 1997

A stack 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 last layer. How many bricks are there all together?

Problem Answer:

There are 639 bricks all together.

Solution:

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