Question

Find the cost of flooring a square room of side $10m$ with marble titles $25cm\times 20cm$ at the rate $Rs7.50$ per title

Answer 1

Area of floor $=sid{e}^2={10}^2=100m^2$

Area of $1$ tile $=\frac{25}{100}\times \frac{20}{100}=\frac{1}{20}{m}^2$

$\Rightarrow$ Number of tiles required $=\frac{100}{\left(\frac{1}{20}\right)}=2000$

$\Rightarrow$ Cost $=7.5\times 2000=$Rs. $15000$.