Question

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

Answer 1

Given, side of square slab = 90 cm

∴ Area of square slab = Side × Side

= 90 × 90

= 8100 sq cm

Given, area = 81 sq m

∵ 1 m = 100 cm

1 sq m = 100 × 100 cm = 10000 cm

And 81 sq m = 810000 sq cm

Now, number of slabs = `"Area of floor"/"Area of one square slab"`

= `810000/8100`

= 100