Question

- Floor of a square room of side 10 m is to be
completely covered with square tiles, each
having length 50 cm. The number of tiles
needed is
(h) 300 (c) 400 (d) 500
al​

Answer 1

(c) 400

Step-by-step explanation:

area of square floor =

${a}^{2} where \: a \: is \: side \: of \: square$

=

${(10m)}^{2} = {(1000cm)}^{2} \\ = 1000000 {cm}^{2}$

now , area of square tile =

${a}^{2} = {(50cm)}^{2} = 2500 {cm}^{2}$

now ,

we know that ,

area of floor = (no. of tiles) × area of each tile

=

$\frac{area \: of \: floor}{area \: of \: each \: tile} = \frac{1000000}{2500} = 400$

so , 400 tiles are required.

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