The glass container shown is filled to a height of 2.25 inches. what percentage of the container is filled with sand?

1. The volume of the container shown in the figure attached, is:

 V=(5 in)(4.5 in)(3 in)
 V=67. 5 in³

 2. The problem says that the container is filled with sand to a height of 2.25 inches. Then, the volume of the sand into the container is:

 V=(5 in)(4.5 in)(2.25 in)
 V=50.62 in³

 3. Therefore, you have:

 67.5 in³100%
 50.62 in³---x

 x=50.62x100/67.5
 x=74.99%

 What percentage of the container is filled with sand? 

 The answer is: 74.99%