We'll first need to find the area of one brick. We'll do this by doing length × width × height.
14 × 8 × 5
= 560
So one brick is 560in³.
Now, to find how many bricks there are, we'll divide the total area of concrete (16,800in³) by the area of one brick (560in³)
16,800 ÷ 560
=
30
There are 30 bricks that the company made.