Q46 of 61 Page 93

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

Given:


Side = 90 cm


Area of square lab = 90 × 90


= 8100 sq.cm


Area of slab = 81sq.m = 81 × 10000 = 810000 sq.cm


Number of slabs = 810000 / 8100


= 100


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