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  1. Chapter 8 Class 8 Comparing Quantities
  2. Serial order wise
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Example 1 (i) A picnic is being planned in a school for Class VII. Girls are 60% of the total number of students and are 18 in number. The picnic site is 55 km from the school and the transport company is charging at the rate of Rs 12 per km. The total cost of refreshments will be Rs 4280. Can you tell. 1. The ratio of the number of girls to the number of boys in the class? Given, Percentage of girls = 60% Number of Girls = 18 Let Total number of Students = x Now, Percentage of girls = (๐‘๐‘ข๐‘š๐‘๐‘’๐‘Ÿ ๐‘œ๐‘“ ๐‘”๐‘–๐‘Ÿ๐‘™๐‘ )/(๐‘‡๐‘œ๐‘ก๐‘Ž๐‘™ ๐‘ ๐‘ก๐‘ข๐‘‘๐‘’๐‘›๐‘ก๐‘ ) ร— 100 60 = 18/๐‘ฅ ร— 100 x = (18 ร— 100)/60 x = 30 โˆด Total Students = 30 Also, Total Students = Number of gives + Number of Boys 30 = 18 + Number of Boys Number of Boys = 30 โ€“ 18 Number of Boys = 12 Thus, Ratio of girls to boys = (๐‘๐‘ข๐‘š๐‘๐‘’๐‘Ÿ ๐‘œ๐‘“ ๐‘”๐‘–๐‘Ÿ๐‘™๐‘ )/(๐‘๐‘ข๐‘š๐‘๐‘’๐‘Ÿ ๐‘œ๐‘“ ๐‘๐‘œ๐‘ฆ๐‘ ) = 18/12 = 3/2 = 3 : 2

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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.