WITHOUT using a calculator (non-calc paper), you have to find the volume of this shape.. NOw i know the volume of a pyramid is 1/3 x base area x height, but this is hard without a calculator.. how would you do this?
The volume of the pyramidal section is
$\displaystyle \frac{1}{3} \cdot (5 \cdot 5) \cdot 6 \, cm^3$
$\displaystyle = \frac{1}{3} \cdot 25 \cdot 6 \, cm^3$
It doesn't matter what order we multiply or divide in, so divide the 6 by 3:
$\displaystyle = 25 \cdot 2 \, cm^3 = 50 \, cm^3$
Can you do the rest?
-Dan