Question

7. How many bricks, each 25 cm long, 16 cm wide and 7.5 cm thick, will be required to
build a balcony 5 m long, 3 m broad and 80 cm high?
​

Answer 1

Step-by-step explanation:

Dimensions of one brick -

Length (l) = 25 cm

Breadth (b) = 16 cm

Thickness (h) = 7.5 cm

So, volume of the brick-

= l×b×h

= 25 cm × 16 cm × 7.5 cm

= 3000 cm³

Now, dimension of the terrace-

Length (l) = 5 m = 500 cm

Breadth (b) = 3 m = 300 cm

Height (h) = 80 cm

So, volume of the terrace -

= l × b × h

= 500 cm × 300 cm × 80 cm

= 12000000 cm³

Then, number of bricks required to build the terrace

= volume of terrace ÷ volume of one brick

= 12000000 cm³/3000 cm³

$\huge{\pink{\boxed{\boxed{\boxed{\purple{\underline{\underline{\green{\mathbf{=4000.}}}}}}}}}}$

:)