Question

The paint in a certain container is sufficient to paint an area equal to 9.375 m². How many bricks of dimensions 22.5 cm × 10 cm × 7.5 cm can be painted out of this container?

Answer 1

Here, l = 22.5 cm, b = 10 cm, h = 7.5 cm. 

Total surface area of 1 brick = 2 (lb + bh + hl) 

= 2(22.5 × 10 + 10 × 7.5 + 7.5 × 22.5) cm² 

= 2(225 + 75 + 168.75) cm² = 937.5 cm² 

= 937. 5x 100/ 100 m² = 0.09375 m². 

∴ required number of bricks = 9. 375 / 0. 09375 . = 100 Ans.