Question

Find the number of marbles slabs of size 20 cm ×30cm required to pave the floor of a square room of side 3m.​

Answer 1

Answer:

150

Step-by-step explanation:

listen

the area of the room is 3*3 = 9m² = 90000cm²

and area of marble is 30*20 = 600cm²

and now for number devide 600 from 90000 and you will get 150.

just check once before applying

Answer 2

Answer :-

• 150 marble slabs are required in total to pave the floor of the square room of side 3 m.

To find :-

• The number of marble slabs required to pave the floor of a square room of side 3 m.

Step-by-step explanation :-

• Before finding the number of marble slabs required, let's find the area of each marble slabe!

We will use the formula required for finding the area of a rectangle!

We know that :-

$\underline{\boxed{\sf Area_{(rectangle)} = Length \times Breadth}}$

Here,

• Length = 30 cm.
• Breadth = 20 cm.

Converting the length and breadth into m,

• Length = 0.3 m.
• Breadth = 0.2 m.

Therefore,

$\rm Area \: of \: each \: slabe = 0.2 \times 0.3$

$\rm Area \: of \: each \: slabe = 0.06 \: m^2$

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• Now, let's find the area of the floor!

We will use the formula required for finding the area of a square!

We know that :-

$\underline{\boxed{\sf Area_{(square)} = Side \times Side}}$

Here,

• Side = 3 m.

Therefore,

$\rm Area \: of \: the \: floor = 3 \times 3$

$\rm Area \: of \: the \: floor = 9 \: m^2$

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• Finally, let's use the formula given below to find the number of marble slabs required!

$\underline{\boxed{\sf No. \: of \: slabs \: needed = \dfrac{Area \: of \: the \: floor}{Area \: of \: each \: slabe}}}$

Here,

• Area of the floor = 9 m².
• Area of each marble slabe = 0.06 m².

Substituting the given values in this formula,

$\bf No. \: of \: slabs \: needed = \cancel{\dfrac{9}{0.06}}$

$\bf{No.\: of \:slabs \:needed = 150}$

Hence :-

• 150 marble slabs are required to pave the square room of side 3 m.

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