# Example 17 - Chapter 8 Class 7 Comparing Quantities

Last updated at Nov. 6, 2018 by Teachoo

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Last updated at Nov. 6, 2018 by Teachoo

Example 17 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 β 100 = 50 lakhs Percentage decrease = (π·ππππππ π ππ ππ’ππππ )/(πΌπππ‘πππ ππ’ππππ) Γ 100% = 50/150 Γ 100% = 5/15 Γ 100% = 1/3 Γ 100% = 100/3 % = 33 π/π %