Final answer:
To build a wall that measures 1,800 square feet, given that one ton of bricks covers 200 square feet, 9 tons of bricks should be purchased. The answer is option D. 9.
Step-by-step explanation:
The subject of this question is to determine how many tons of bricks should be purchased to build a wall that is 1,800 square feet given that a wall that is 10 feet high and 20 feet long contains one ton of bricks. To find the answer, we should first understand the coverage of one ton of bricks and then use that to calculate the amount needed for the 1,800 square feet wall.
Firstly, we calculate the area of the wall that contains one ton of bricks: 10 feet high x 20 feet long = 200 square feet.
Now, we need to find out how many times 200 square feet goes into 1,800 square feet to know how many tons we need: 1,800 square feet / 200 square feet = 9. Thus, 9 tons of bricks will be needed for an 1,800 square feet wall.
The correct answer is D. 9 based on the calculations provided.