Question

The bricks of dimensions 25 m X 12.5 cm X 7.5 cm required to build a wall 5 m X 3 m X 20 m are

• A. 1280
• B. 1285
• C. 1290
• D. 1295

Answer 1

The correct option is A 1280

Given the dimensions of bricks are $25m\times 12.5cm\times 7.5cm$and dimension of wall is $5m\times 3m\times 20m$

All made in cm then dimensions of bricks are $2500cmm\times 12.5cm\times 7.5cm$

Then volume of brick= $2500cmm\times 12.5cm\times 7.5cm=234375$$c{m}^3$

And dimension of wall is $500cm\times 300cm\times 2000cm$

And volume of walk=$500cm\times 300cm\times 2000cm=300000000$$c{m}^3$

Then number of bricks=$\frac{3000000000}{234375}=1280$