Question
Class 'P' has a total of 160 students. The ratio of
girls to boys in this class is 2:6. The average number of boys in classes 'P' and 'Q' is 180, and the average number of girls in these two classes is 110. What is the total number of students in class 'Q'?Solution
ATQ; Number of girls in class P = (2/8) × 160 = 40 Number of boys in class P = (6/8) × 160 = 120 Number of boys in class Q = 180 × 2 − 120 = 360 − 120 = 240 Number of girls in class Q = 110 × 2 − 40 = 220 − 40 = 180 Total number of students in class Q = 240 + 180 = 420
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