Example 11 - Chapter 7 Class 7 Comparing Quantities

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Example 11 The number of illiterate persons in a country decreased from 150 lakhs to 100 lakhs in 10 years. What is the percentage of decrease? Initial number of illiterate people = 150 lakhs Number of illiterate people after 10 years = 100 lakhs Decrease in number of illiterate people = 150 − 100 = 50 lakhs Percentage decrease = (𝑫𝒆𝒄𝒓𝒆𝒂𝒔𝒆 𝒊𝒏 𝒏𝒖𝒎𝒃𝒆𝒓 )/(𝑰𝒏𝒊𝒕𝒊𝒂𝒍 𝒏𝒖𝒎𝒃𝒆𝒓) × 100% = 50/150 × 100% = 5/15 × 100% = 1/3 × 100% = 100/3 % = 33 𝟏/𝟑 %