Example 2 (Page 58) - Chapter 3 Class 8 - Proportional Reasoning-2 (Ganita Prakash II)

Transcript

Example 2 (Page 58) Cement concrete is a mixture of cement, sand, and gravel, and is widely used in construction. The ratio of the components in the mixture varies depending on how strong the structure needs to be. For structures that need greater strength like pillars, beams, and roofs, the ratio is 1 : 1.5 : 3, and the construction is also reinforced with steel rods. Using this ratio, if we have 3 bags of cement, how many bags of concrete mixture can we make?Our Ratio of Cement, Sand and Gravel is 1 : 1.5 : 3 Thus, Cement paint in this ratio is 1 bag Since we need 3 bags i.e. 1 × 3 = 3 Thus, we multiply original recipe by 3 (i.e. 3 × ) Now, Cement = 1 × 3 = 3 Sand = 1.5 × 3 = 4.5 Gravel = 3 × 3 = 9 Thus, Total bags of concrete mixture = Cement Bags + Sand bags + Gravel bags = 3 + 4.5 + 9 = 16.5 bags Therefore, there are 16.5 bags of concrete