Question

The form he builds is 40 1/2 in. long, 10 in. deep, and 8 in. high. How much cement is needed to fill the form ​

Answer 1

This question clearly states that it is a 'find the volume' question.

Given dimensions of the object are :

Length of the object = $40\frac{1}{2}$ inches or 40.5 inches

Depth of the object = 10 inches

Height of the object is = 8 inches

So, the volume becomes = $40.5\times10\times8$ = 3240 cubic inch

Hence, the amount of cement needed is 3240 cubic inches.