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.