## Answers

given, dimensions of wall:-

length = 15m. = 1500 cm

breadth = 20cm

height = 2m. = 200 cm

volume of wall = **l*b*h**

** = 1500 * 20 * 200**

** = 6000000 cubic cm**

given, dimensions of a brick :-

length = 20 cm

breadth = 10 cm

height = 7.5 cm

volume of 1 brick = **l * b * h**

** = 20 * 10 * 7.5**

** = 1500 cubic cm.**

**no. of bricks = volume of wall / volume of 1 brick**

** **= 6000000 / 1500

= **4000 bricks**

now cost of 1 brick = Rs. 2.25

∴ cost of 4000 bricks = **4000 * 2.25 **

** = Rs. 9000---------------------**Ans.

** **