Answer:
<u>There are 18 rows of bricks are needed</u>
<h2><em>
Explanation:</em></h2>
- The mason wants to lay the bricks so that the shortest edge of each
brick is vertical.
- We need to find how many rows of bricks are needed
* At first lets change the height of the wall to inch
∵ 1 foot = 12 inches
∴ 4 feet = 4 × 12 = 48 inches
∵ The height of the wall is 1 1/8 inch less than 4
∴ The height of the wall = 48 - 1 1/8 = 46.875 inches
- Assume that the number of rows is n
∵ The shortest edge of the brick is 2 1/4 inch
∵ The mason will spread 3/8 inch of mortar on top of all but the last
row of bricks
∴ The height of each bricks with mortar = 2 1/4 + 3/8 = 2.625 inches
∵ All the rows have mortar on the top except the last row
∵ The number of rows are n
∴ The number of rows with mortar is (n - 1)
∴ The height of the wall = 2.625 (n - 1) + 2 1/4
∵ The height of the wall is 46.875 inches
∴ 2.625 (n - 1) + 2 1/4 = 46.875
- Subtract 2 1/4 from both sides
∴ 2.625(n - 1) = 44.625
- Divide both sides by 2.625
∴ n - 1 = 17
- Add for both sides
∴ n = 18
∵ n represents the number of rows
∴ There are 18 rows of bricks are needed
Hope Helps
<em>And I Oop-</em>
<em>:)</em>
Brainliest pls