Volume of Regular Solids

Q.

What is the formula for the volume of a sphere?

1. $V=3\pi r^3$

2. $V=\frac{4}{3}\pi r^3$

3. $V=2\pi r^3$

4. $V=\frac{2}{3}\pi r^3$

Q. How many bricks will be needed to build a wall of $8m\times 6m\times 22.5cm$, where each brick measures $25cm\times 11.25cm\times 6cm$?

1. $5600$
2. $6000$
3. $6400$
4. $7200$