Question

Find the number of bricks each of dimensions 25 cm x 12.5 cm x 7.5 cm to make a wall of dimensions 5 m 3 m 20 m.
(1) 1200
(2) 1350
(2) 128000
(4) 1400​

Answer 1

${\large{\bf{\red{\clubs{\underline{Given :}}}}}}$

The number of bricks each of dimensions 25 cm x 12.5 cm x 7.5 cm and wall of dimensions 5m x 3m x 20m.

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${\large{\bf{\blue{\clubs{\underline{To Find:}}}}}}$

Find the no. of bricks required to make the wall.

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${\large{\bf{\orange{\clubs{\underline{Solution :}}}}}}$

First,

${\sf{\purple{Length \: of \: wall = 25 cm \times 12.5 cm \times 7.5}}}$

${\sf{\red{Length \: of \: brick = 2343.75cm}}}$

Next,

Converting dimension of wall into cm :

${\sf{\purple{5m = 500cm}}}$

${\sf{\purple{3m = 300cm}}}$

${\sf{\purple{20m = 2000cm}}}$

Than,

${\sf{\purple{Dimension \: of \: wall = 500 \times 300 \times 2000}}}$

${\sf{\red{= 30,00,00,000cm \: or \: 30,00,000m}}}$

Than,

${\sf{\purple{No. \: of \: bricks \: required = {\cancel\frac{300000000}{2343.75} }}}}$

${\blue{\underbrace{\red{\boxed{\bf{= 1,28,000}}}}}}$

So,

1,28,000 bricks will be required for making the wall.

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${\sf{\pink{\blue{\fcolorbox{green}{red}{\underline{XitzNobitaxX}}}}}}$

Answer 2

Required Answer :

The number of bricks required to make the wall = 128,000

Given :

Dimensions of bricks :

• Length of the bricks = 25 cm
• Breadth of the bricks = 12.5 cm
• Height of the bricks = 7.5 cm

Dimensions of wall :

• Length of the wall = 5 m
• Breadth of the wall = 3 m
• Height of the wall = 20 m

To find :

• Number of bricks required to make a wall

Solution :

Using formula,

• Volume of bricks = l × b × h

where,

• l denotes the length
• b denotes the breadth

Substituting the given values :

⇒ Volume of bricks = 25 × 12.5 × 7.5

⇒ Volume of bricks = 2,343.75

Volume of bricks = 2,343.75 cm³

Using formula,

• Volume of wall = l × b × h

Substituting the given values :

⇒ Volume of wall = 5 × 3 × 20

⇒ Volume of wall = 300

Volume of wall = 300 m³

As we know,

• 1 m = 100 cm

To convert the value from cm into m, multiply the value by 100.

⇒ Volume of wall = 300 × (100)³

⇒ Volume of wall = 300 × 1000000

⇒ Volume of wall = 300000000

Volume of wall = 3 × 10⁸ cm³

Number of bricks required to make the wall = Volume of wall ÷ Volume of bricks

⇒ Number of bricks = 3 × 10⁸ ÷ 2,343.75

⇒ Number of bricks = 300000000 ÷ 2,343.75

⇒ Number of bricks = 128,000

Therefore, the number of bricks required to make the wall = 128,000