Question

How many square slabs each with a side of 90 cm are required to cover a floor of area $81{\text{m}}^2$ ?

• A. 100

Answer 1

The correct option is A 100

Given:
Side of the square slab = 90 cm
Area of square slab
$=90\times 90=8100c{m}^2$

$\text{Area of the floor}=81m^2$

We know that,
$1m=100cm1m^2=10,000c{m}^2$

So,
$81m^2=81\times 10,000=8,10,000c{m}^2$

Number of slabs required
$=\frac{810000}{8100}=\frac{8100}{81}=100$

Therefore, 100 such square slabs are required to cover the floor.