Q3 of 12 Page 108

How many bricks of length 25 cm, breadth 15 cm, and height 10 cm are required to build a wall of length 6 m, height 2.5 m, and breadth 0.5 m?

Given:


For one brick,


Length = 25 cm, breadth = 15 cm, height = 10 cm


For wall,


Length = 6 m = 6 × 100 cm = 600 cm


Breadth = 0.5 m = 0.5 × 100 = 50 cm


Height = 2.5 m 2.5 × 100 = 250 cm


Now, the number of bricks required to build a wall is given by,



Both wall and brick are cuboidal in shape.


Hence, the volume is given by,


The volume of wall = l × b × h


= 600 × 50 × 250


= 7500000 cm3


The volume of one brick = l × b × h


= 25 × 15 × 10


= 3750 cm3


= 2000 bricks


∴2000 bricks are required to build a wall of dimensions 6 × 0.5 × 2 m.


More from this chapter

All 12 →
1

Find the volume of a box if its length, breadth, and height are 20 cm, 10.5 cm and 8 cm respectively.

 2

A cuboid shape soap bar has volume 150 cc. Find its thickness if its length is 10 cm and breadth is 5 cm.

 4

For rainwater harvesting, a tank of length 10 m, breadth 6 m, and depth 3m are built. What is the capacity of the tank? How many liters of water can it hold?

 1

In each example given below, the radius of the base of a cylinder and its height are given. Then find the curved surface area and total surface area.

(1) r = 7 cm, h = 10 cm


(2) r = 1.4 cm, h = 2.1 cm


(3) r = 2.5 cm, h = 7 cm


(4) r = 70 cm, h = 1.4 cm


(5) r = 4.2 cm, h = 14 cm