Question

A marble tile measures $10cm\times 14cm.$ How many tiles will be required to cover a wall of size $2.8m\times 4m$?

Answer 1

Area of rectangle $=l\times b$

The area of 1 tile $=10\times 14=140{cm}^2=0.014m^2$

The area of wall $=2.8\times 4=11.2m^2$

No. of tiles required to cover a wall of size $11.2m^2=\frac{11.2}{0.014}=800$

Hence, 800 tiles will be required to cover a wall of size $2.8m\times 4m$.