Question
The number of students in class 'A' is 90, and the ratio
of girls to boys is 3:2. If the average number of boys in classes A and B is 120, and the average number of girls is 132, find the total number of students in class B.Solution
Number of girls in class A = (3/5) × 90 = 54
Number of boys in class A = (2/5) × 90 = 36
Number of boys in class B = 120 × 2 - 36 = 240 - 36 = 204
Number of girls in class B = 132 × 2 - 54 = 264 - 54 = 210
Total number of students in class B = 204 + 210 = 414
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