Question

How many bricks 15 cm X 10 cm x 6 cm are needed to construct a wall 10 m long 0.3 m thick
and 6 m high ?​

Answer 1

area of wall =l×b×h
=1000×30×600
=18000000cm^2
area of bricks=15×10×6
=900cm^2

no.of bricks needed
to construct a wall=18000000/900
=20,000 bricks.

Answer 2

20000 bricks are needed to construct a wall.

Step-by-step explanation:

Given, dimensions of bricks = 15 cm x 10 cm x 6 cm

Volume of a brick = (15 x 10 x 6) cm³ = 900 cm³

Dimensions of a wall = 10 m x 0.3 m x 6 m

1 m = 100 cm

Volume of a wall = (1000 x 30 x 600) cm³ = 18000000 cm³

Number of bricks needed = $\frac{18000000}{900}$ = 20000

Hence, 20000 bricks are needed to construct a wall.