How many bricks, each of dimensions 25 cm x 16 cm x 10 cm will be

Answer: (a) 14400

Solution:-
The dimensions of a brick = 25 cm, 16 cm and 10 cm
Then, the volume of a brick = 25 x 16 x 10
= 4000 cm^3

The dimensions of a wall = 24 m, 6 m and 0.4 m
Then, volume of the wall = 24 x 6 x 0.4
= 57.6 m^3
= 57600000 cm^3

So, the number of bricks to built the wall = 57600000/4000
= 14400

Hence, the correct answer is option (a) 14400.