Question

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7. Case Study Based-)
A number of bricks were stacked in the following manner.
25 bricks in the bottom row,
24 in the next row, 23 in the row next to it and so on, forming a rows​

Answer 1

Given : A number of bricks were stacked in the following manner.

25 bricks in the bottom row, 24 in the next row, 23 in the row next to it and so on, forming a rows​

To Find : Total number of bricks

Solution:

1st row  = 25

2nd row  = 24

34rd row  = 23

Last row  = 1

So we have bricks  = 25 + 24 + 23 + ________ + 2 + 1

= 1 +  2 + 3 + _________ + 23 + 24 + 25

= 25(25 + 1)/2

= 25 * 13

= 325

325 bricks are there in stack

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