Question
The number of students in class 'A' is 108, and the ratio
of girls to boys is 5:4. If the average number of boys in classes A and B is 114, and the average number of girls is 129, find the total number of students in class B.Solution
Number of girls in class A = (5/9) × 108 = 60
Number of boys in class A = (4/9) × 108 = 48
Number of boys in class B = 114 × 2 - 48 = 228 - 48 = 180
Number of girls in class B = 129 × 2 - 60 = 258 - 60 = 198
Total number of students in class B = 180 + 198 = 378
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