The number of bricks on the bottom row was 21, and each row above it had 2 fewer bricks. If there were 11 rows in the stack of bricks, how many bricks were there altogether?

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asked Mar 18, 2021 84.5k views

5 votes

The number of bricks on the bottom row was 21, and each row above it had 2 fewer

bricks. If there were 11 rows in the stack of bricks, how many bricks were there altogether?

Mathematics
middle-school

Pankrat asked

by Pankrat

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2 Answers

4 votes

Answer:

121

Explanation:

21-2x

add all of the sums from 0 - 11

Lakerfield answered Mar 19, 2021

by Lakerfield

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4 votes

Answer: 121

Explanation:

Ejoubaud answered Mar 22, 2021

by Ejoubaud

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