Question

How many brick each 25cm long 10cm wide and 7.5cm thick, will be required for wall 15m long 2.5cm hight and 1.25m thick.

Answer 1

$\spades \tt \: Length \: of \: brick \: = 25cm$

$\spades \tt \: Breadth \: of \: brick = 10cm$

$\spades \tt \:Thickness \: of \: brick \: = 7.5cm$

$\\ \clubs \tt \:L ength \: of \: wall = 15m = 1500cm$

$\clubs \tt \: Breadth \: of \: wall = 2.5cm$

$\clubs \tt \: Height \: of \: wall = 1.25m = 125cm$

$\hearts \tt \: Number \: of \: bricks = \dfrac{volume \: of \: wall}{volume \: of \: brick} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \tt = \dfrac{1500 \times 2.5 \times 125}{25 \times 10 \times 7.5}$

${ \red{\boxed {\mathfrak { \dag required \: bricks = 250 \dag}}}}$

Answer 2

• 250 bricks .

Given :-

• Dimensions of each brick :- 25cm long 10cm wide and 7.5cm thick .
• Dimensions of wall = 15m long 2.5cm height and 1.25m thick.

To Find :- How many brick will be required for wall ?

Formula used :-

• Bricks and wall both are in shape of a cuboid .
• Volume of cuboid = Length × Breadth × Height .
• 1 m = 100 cm .

Solution :-

Brick :-

→ Length = 25 cm

→ Width = 10 cm

→ Thick = 7.5 cm

So,

→ Volume of each brick = L × B × H = 25 × 10 × 7.5 = 1875 cm³

Wall :-

→ Length = 15 m = 15 × 100 = 1500 cm

→ Height = 2.5 cm

→ Thick = 1.25 m = 1.25 × 100 = 125 cm

So,

→ Volume of wall = 1500 × 2.5 × 125 = 468750 cm³

then,

→ Total number of bricks required for wall = Volume of wall / Volume of each brick = 468750 / 1875 = 250 bricks (Ans.)

Therefore, 250 bricks are required for wall .

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