Question
The number of students in class 'A' is 100, and the ratio
of the number of girls to boys is 2:3. If the average number of boys in classes A and B is 105, and the average number of girls is 95, find the total number of students in class B.Solution
Number of girls in class A = (2/5) × 100 = 40
Number of boys in class A = (3/5) × 100 = 60
Number of boys in class B = 105 × 2 - 60 = 210 - 60 = 150
Number of girls in class B = 95 × 2 - 40 = 190 - 40 = 150
Total number of students in class B = 150 + 150 = 300
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