Question
The number of students in class 'A' is 104, and the
ratio of girls to boys is 4:9. If the average number of boys in classes 'A' and 'B' is 124, and the average number of girls is 96, find the total number of students in class 'B'.Solution
Number of girls in class A = (4/13) × 104 = 32
Number of boys in class A = (9/13) × 104 = 72
Number of boys in class B = 124 × 2 - 72 = 248 - 72 = 176
Number of girls in class B = 96 × 2 - 32 = 192 - 32 = 160
Total number of students in class B = 176 + 160 = 336
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