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