Question

How many square tiles of side $9cm$ will be needed to fit in a square floor of a bathroom of side $720cm$? Find the cost of tilling at the rate of $Rs.7.50$ per tile.

Answer 1

Side of square of tile $=9cm$

Area of a square tile $=Side\times Side$

$=(9\times 9)c{m}^2$

$=81c{m}^2$

Side of a square floor $=20cm$

Area of square floor $=Side\times Side$

$=(20\times 20)c{m}^2$

$=400c{m}^2$

No. of tiles required to lift in a floor $=\frac{Areaofsquarefloor}{Areaofsquaretile}$

$=\frac{400}{81}$

$=4.93$

$\cong 5$

Cost of one tile $=Rs.7.50$

Cost of $5$ tiles $=Rs.(7.50\times 5)$

$=Rs.37.50$

$\therefore$ No. of tiles required $=5$

Cost of tiling $=Rs.37.50$