An estimated 90% of the world’s population lives in the Northern Hemisphere. Find the (approximate) number of people Class 8

An estimated 90% of the world’s population lives in the Northern Hemisphere. Find the (approximate) number of people Class 8

Question 1.

An estimated 90% of the world’s population lives in the Northern Hemisphere. Find the (approximate) number of people living in the Northern Hemisphere based on this year’s worldwide population. Class 8

Solution:

Present population of the world is about 8.3 billion.

So, population of Northern Hemisphere

= 90% of 8.3 billion

= [latex]\frac{90}{100}[/latex] × 8.3 billion

= 7.47 billion.

Question 2.

A recipe for the dish, halwa, for 4 people has the following ingredients in the given proportions— Rava : 40%, Sugar: 40%, and Ghee : 20%. Class 8

(i) If you want to make halwa for 8 people, what is the proportion of each of the above ingredients?

(ii) If the total weight of the ingredients is 2 kg, how much rava, sugar and ghee are present?

Solution:

(i) For 8 people proportion of each ingredients will remain the same, i.e., Rava : 40%, Sugar : 40%, and Ghee : 20%.

(ii) Total weight = 2 kg

So, Rava = 40% of 2 kg = [latex]\frac{40}{100}[/latex] ×2 = 0.8 kg;

Sugar = 40% of 2 kg = [latex]\frac{40}{100}[/latex] × 2 = 0.8 kg;

and Ghee = 20% of 2 kg = [latex]\frac{20}{100}[/latex] × 2 = 0.4 kg.