Ex 7.1, 3 - Chapter 7 Class 8 Comparing Quantities

Last updated at April 16, 2024 by

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Ex 7.1, 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 % Now, 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 has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.