Question

How many square slabs each with a side of 90 cm are required to cover a floor of area 81 sq m?

• A. 200
• B. 150
• C. 100
• D. 50

Answer 1

The correct option is C 100

Given:
Side of the square slab = 90 cm
Area of square slab
= 90 × 90
= 8100 sq cm

Area of slab = 81 sq

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

So, 81 sq m = 81 × 10,000
= 8,10,000 sq cm

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

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