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  1. Chapter 8 Class 8 Comparing Quantities
  2. Serial order wise
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Ex 8.1, 3 72% of 25 students are good in mathematics. How many are not good in mathematics? Given, Total Students = 25 Percentage of Students good in mathematics = 72 % Percentage of Students not good in mathematics = 100% − 72% Percentage of Students not good in mathematics = 28% Finding number of students not good in mathematics Let number of Students not good in Mathematics = x Percentage = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑠𝑡𝑢𝑑𝑒𝑛𝑡𝑠 𝑛𝑜𝑡 𝑔𝑜𝑜𝑑 𝑖𝑛 𝑚𝑎𝑡ℎ𝑒𝑚𝑎𝑡𝑖𝑐𝑠)/(𝑇𝑜𝑡𝑎𝑙 𝑠𝑡𝑢𝑑𝑒𝑛𝑡𝑠) × 100 28 = 𝑥/25×100 28 = 𝑥 × 4 28/4 = x 7 = x x = 7 ∴ 7 Students are not good in mathematics

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.