Question

The number of marble slabs of size $20cm\times 30cm$ required to pave the floor of a square room of side $3m$ is:

• A. $100$
• B. $150$
• C. $225$
• D. $25$

Answer 1

The correct option is B $150$

Area of marble slab$=20\times 30=600c{m}^2$.

Area of the floor $=3m^2$

We know that: $1m=100cm$

Therefore, total no. of marble slabs $=$ $\frac{areaoffloor}{areaofmarbletile}$

$=\frac{9\times {100}^2}{600}=150$ tiles