Ex 5.2, 1 A survey was made to find the type of music that a certain group of young people liked in a city. Adjoining pie chart shows the findings of this survey. From this pie chart answer the following: (i) If 20 people liked classical music, how many young people were surveyed?
Let the Total number people surveyed = x
Number of people who like Classical Music
= 10% of Total number of people
= 10/100×𝑥
= 1/10 ×𝑥
Given,
Number of people who liked classical music = 20
1/10 × 𝑥=20
𝑥=20 × 10
𝑥=200
Thus,
Total number of people = x = 200
∴ 200 people were surveyed.
Ex 5.2, 1 (ii) Which type of music is liked by the maximum number of people?
In the pie chart,
Maximum percentage shown = 40%
∴ Maximum number of people like Light music
Ex 5.2, 1 (iii) If a cassette company were to make 1000 CD’s, how many of each type would they make?
∴ The cassette company should make
400 CD’s of light music,
300 CD’s of folk music,
100 CD’s of Classical music and
200 CD’s of Semi Classical music

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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