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 tiling at the rate of rupees $7.50$ per tile.

Answer 1

Side of square tile $=9cm$

Side of a square bathroom $=720cm$

We know that the area of the square $=(side{)}^2$

No of tiles required $=\frac{\text{(Area of Bathroom)}}{\text{(area of}1\text{tile)}}$
$=\frac{(720\times 720)}{(9\times 9)}=6400$ tiles

Cost of tiling 1 tile $=Rs.7.50$

Total cost of tiling $=$ No of tiles $\times$ Cost of $1$ tile $=6400\times 7.5=Rs.48000$