Ex 2.2, 10 The number of boys and girls in a class are in the ratio 7 : 5. The number of boys is 8 more than the number of girls. What is the total class strength?Given that
Number of Boyβs and Girlβs in a class are in the ratio 7:5
(ππ’ππππ ππ π΅ππ¦π )/(ππ’ππππ ππ πΊππππ )=7/5
Let the number of boys in the class = 7x
& the number of girls in the class = 5x
Given that number of boys is 8 more than the number of girls.
Number of Boys = Number of Girls + 8
7x = 5x + 8
7x β 5x = 8
2x = 8
x = 4
Therefore,
Number of Boys = 7x = 7 Γ 4 = 28
& Number of Girls = 5x = 5 Γ 4 = 20
Total class strength = Number of boys + Number of Girls
= 28 + 20
= 48 Students

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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