Answer:27
Step27-by-step explanation:
For this case we have that by definition the mass is given by:

Where,
- <em>D: density
</em>
- <em>V: Volume
</em>
The volume of a pyramid is given by:

Where,
- <em>A: area of the base
</em>
- <em>h: height
</em>
Substituting values we have:

We now calculate the mass:

Answer:
he needs 7.74 pounds of zinc