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% โ 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 = (๐๐ข๐๐๐๐ ๐๐ ๐ ๐ก๐ข๐๐๐๐ก๐ ๐๐๐ก ๐๐๐๐ ๐๐ ๐๐๐กโ๐๐๐๐ก๐๐๐ )/(๐๐๐ก๐๐ ๐ ๐ก๐ข๐๐๐๐ก๐ ) ร 100
28 = ๐ฅ/25ร100
28 = ๐ฅ ร 4
28/4 = x
7 = x x = 7
โด 7 Students are not good in mathematics

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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