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In a class of certain number of students, in the First semester the ratio between the girls and boys is 6 : 7. In the Second semester, there are 6 girls added into the class and 3 boys left the class, then the ratio of girls to boys becomes 9 : 8. In second semester, find the total number of girls in a class.1. 222. 243. 414. 295. 36 |
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Answer» Correct Answer - Option 5 : 36 Given: Let number of girls and boys present in a class for the first semester be 6a and 7a respectively. Calculation: ⇒ (6a + 6) : (7a - 3) = 9 : 8 ⇒ 48a + 48 = 63a - 27 ⇒ a = 5 The number of girls present in a class for first semester = 6 × 5 = 30 ∴ The number of girls present in a class for second semester = 30 + 6 = 36 |
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