Question

How many hollow blocks of size 30cm # 15cm # 20cm are needed to construct a wall 60m in length, 0.3m in breadth and 2m in height?

Answer 1

According to question

Dimensions of one brick
l = 30 Cm
b = 15 Cm
h = 20 Cm

Thus Volume of one brick = l * b * h
                                          = 30 * 15 * 20
                                         = 9000 Cm^3  = 9 m^3

Dimensions of wall
L = 60 m
B = 0.3 m
H = 2 m
Thus

Volume of wall = L * B * H
                         = 60 * 0.3 * 2
                        = 36 m^
Thus
Clearly    number of bricks required = 36 / 9 = 4 bricks