The area of a wall is 10m x 9m. If the size of one tile is 18cm x 20cm, then find the total number of tiles needed to tile the whole wall.

250

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2500

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400

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Solution

The correct option is C 2500
$1 m = 100 c m$ $∴ 1 m^{2} = 1 m \times 1 m = 100 c m \times 100 c m$
= $10, 000 c m^{2}$
$∴$ The area of the wall = $10 m \times 9 m = 90 m^{2} = 9, 00, 000 c m^{2}$
The are of a tile = $18 c m \times 20 c m$
= $360 c m^{2}$
$∴$ The number of tiles needed = The area of the wall $\div$ the area of a tile
$\Rightarrow 9, 00, 000 c m^{2} \div 360 c m^{2}$
= $2500$ tiles

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Q. The area of a wall is 10m x 9m. If the size of one tile is 18cm x 20cm, then find the total number of tiles needed to tile the whole wall.

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The area of a wall is 10m x 9m. If the size of one tile is 18cm x 20cm, then find the total number of tiles needed to tile the whole wall.

The correct option is C 25001m=100cm ∴1m2=1m×1m=100cm×100cm =10,000cm2 ∴The area of the wall = 10m×9m=90m2=9,00,000cm2 The are of a tile = 18cm×20cm = 360cm2 ∴ The number of tiles needed = The area of the wall ÷ the area of a tile ⇒ 9,00,000cm2÷360cm2 = 2500 tiles