Question

In a certain brick wall, each row of bricks above the bottom row contains one less brick than the row just below it. If there are 4 rows in all and a total of 86 bricks in the wall, how many bricks does the bottom row contain?
a) 21
b) 22
c) 23
d) 24​

Answer 1

Answer: D

Step-by-step explanation:

Let number of bricks in bottom row=x

Total number of bricks = 75

Total number of rows = 5

x+ x-1 + x-2 + x -3 + x-4 = 75

=> 5x = 85

=> x= 17

Number of bricks in the bottom row = 17

Answer 2

Answer:

(a) 21

Step-by-step explanation:

hope this helps you