Question
The number of students in class 'A' is 128, and the
ratio of the number of girls to boys is 5:11. If the average number of boys in classes A and B is 148, and the average number of girls is 102, find the total number of students in class B.Solution
Number of girls in class A = (5/16) × 128 = 40
Number of boys in class A = (11/16) × 128 = 88
Number of boys in class B = 148 × 2 - 88 = 296 - 88 = 208
Number of girls in class B = 102 × 2 - 40 = 204 - 40 = 164
Total number of students in class B = 208 + 164 = 372
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