To calculate the total amount of concrete needed to make 1800 bricks, you need to know the volume of one brick and then multiply it by the number of bricks.
The volume of a rectangular prism can be calculated by multiplying its length, width, and height. In this case, the length is 6 inches, the width is 3 inches, and the height is 2 inches.
Volume of one brick = Length * Width * Height
= 6 inches * 3 inches * 2 inches
= 36 cubic inches
Now, to find the total amount of concrete needed for 1800 bricks, we'll multiply the volume of one brick by the number of bricks:
Total amount of concrete needed = Volume of one brick * Number of bricks
= 36 cubic inches * 1800 bricks
= 64,800 cubic inches
Therefore, they will need 64,800 cubic inches of concrete to make 1800 bricks.