a)
If 4700 bricks each of size 25 cm x 16 cm x 10 cm are required to construct a wall
20 m long and 20 cm wide containing two windows of size 2 m x 1.5 m each, find
the height of the wall.
Answers
Step-by-step explanation:
Solution
Area of wall = length of wall * breadth of wall
= (20*100 cm) * 20cm
= 2000 cm × 20 cm
= 40000 cm^2
Area of window = length of window * breadth of
window
= 2 × 1.5
= 3cm^2
Area of two window = 2× Area of window
= 2× 3
= 6cm^2
Total area of wall without window =40000cm^2- 6 cm^2
=39994cm^2
We know that,
Number of brick = volume of wall / volume of
brick
4700 = (area of wall × height of wall) (length× breadth× height of brick)
4700 = 39994cm^2× height / 4000cm^3
4700× 4000= 39994× height of wall
18800000cm^3= 39994 cm^2 × height of wall
18800000cm^3/ 39994 cm^2 = height of wall
Height of wall = 4707.06 cm