Question

Marble size is 20cm * 30cm how many marbles are required to cover a square with side 3m

Answer 1

$dimention \: of \: marble = (20 \times 30)cm \\ = 600 \: cm^{2} \\ \\ \\ \\ dimension \: of \: square \: area \: = (3 \times 3)m^{2} \\ = (3 \times 3 \times 100 \times 100)cm^{2} \\ = 90000 \: cm ^{2} \\ \\ needed \: marble = \frac{area \: of \: square}{area \: of \: on \: marble} \\ = \frac{90000}{600} \\ = \frac{900}{6} \\ = 150$
hence we need 150 marbles......

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Answer 2

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