Question

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Answer 1

Correct Question :-

A marble tile measures 25cm by 20cm. How many tiles will be required to cover a wall of size 4m by 3m

Answer :-

we know that,

$\boxed{\bold {area \: of \: rectangle = l \times b }}$

and

• length of marble tile = 25cm = 0.25m
• breadth of marble tile = 20cm = 0.2m

$\bold{: \implies 0.25 \times 0.2 } \: \: \: \: \: \: \: \: \: \: \: \\ \\ \bold{: \implies0.05 \: {m}^{2} } \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

so, area of a marble tile is 0.05 m²

and

• length of the wall = 4 m
• breadth of the wall = 3 m

$\bold{: \implies 4 \times 3} \\ \\ \bold{: \implies 12 {m}^{2} }$

so, area of the wall is 12m²

now, we have to find no. of tiles required to cover a wall

let n tiles are required

$\bold{ : \implies \: n = \frac{area \: of \: wall}{area \: of \: one \: tile} } \\ \\ \bold{: \implies \cancel \frac{12}{0.05} } \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \bold{: \implies \cancel \frac{1200}{5} } \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \bold{: \implies \orange{ 240 }} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

hence, 240 tiles are required to cover the wall