In a survey, 200 students were asked what influenced them most to buy their latest CD. The results are shown in the circle graph
a. How many students said radio influenced them most
b. How many more students were influenced by radio than by a music video channel
c. How many said a friend or relative influenced them or they heard the CD in a shop

Solution:

Let us observe the image carefully and answer the questions using fractions rules.

a. Number of students who were influenced by radio = 9/20 × 200 = 90

b. Number of students who were influenced by music video channel = 2/25 × 200 = 16

Number of students who were influenced by radio = 90

Hence, 90 - 16 = 74 more students were influenced by radio than by a music video channel.

c. Number of students who were influenced by a friend or relative = 3/20 × 200 = 30

Number of students who were influenced by hearing or seeing the CD in a shop = 30

Total number of students who were influenced by both friend or relative and hearing the CD in a shop = 30 + 20 = 50

✦ Try This: Simplify: [2(1/3) + 25/5] / [2(3/4) ÷ 1/6]

To solve the above problem you can follow the fractions rules to get the required answer.

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 2

NCERT Exemplar Class 7 Maths Chapter 2 Exercise Problem 96

In a survey, 200 students were asked what influenced them most to buy their latest CD. The results are shown in the circle graph: a. How many students said radio influenced them most, b. How many more students were influenced by radio than by a music video channel, c. How many said a friend or relative influenced them or they heard the CD in a shop

Summary:

On Simplifying we have:
a. 90 students said radio influenced them most.
b. 74 more students were influenced by radio than by a music video channel.
c. 50 said a friend or relative influenced them or they heard the CD in a shop

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