Question

9. A wall 9 m long, 6 m high and 20 cm thick, is
to be constructed, using bricks of dimensions
30 cm, 15 cm and 10 cm. How many bricks
will be required ?​

Answer 1

Answer:

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Step-by-step explanation:

Given :-

Dimensions of wall :-

Length of the wall = 9 m = 9 x 100 cm = 900 cm

Height of the wall = 6 m = 6 x 100 cm = 600 cm

Breadth of the wall = 20 cm

Dimensions of Bricks :-

= 30 x 15 x 10 cm

Solution :-

Volume of the wall = 900 x 600 x 20 cm3 = 10800000 cm²

Volume of one Brick = 30 x 15 x 10 cm3 = 4500 cm³

Number of bricks required to construct the wall =  volume of wall/volume of one brick = 10800000/4500  = 2400

Hence, 2400 bricks will be required.

Answer 2

Answer:

Area of wall with dimensions=900cm*600cm*20cm

=10800000cm^2

Area of the bricks=30cm*15cm*10cm

=4500cm^2

No. of bricks required=10800000/4500

=2400 bricks

Hence, 2400 bricks would be required to construct the wall.