Question
The number of students (boys + girls) in class 'A' is
96, and the ratio of the number of girls to boys in class 'A' is 2:1. If the average number of boys in classes 'A' and 'B' is 78 and the average number of girls in classes 'A' and 'B' is 84, then find the total number of students in class 'B'.Solution
Number of girls in class A = (2/3) Ă— 96 = 64
Number of boys in class A = (1/3) Ă— 96 = 32
Number of boys in class B = 78 Ă— 2 - 32 = 156 - 32 = 124
Number of girls in class B = 84 Ă— 2 - 64 = 168 - 64 = 104
Total number of students in class B = 124 + 104 = 228
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