Question
Three sections of a college have 30, 25 and 35 students
respectively. The average marks of Section B is 68 and that of Section C is 72. The combined average of all three sections together is 70. What is the average marks (correct to two decimal places) of Section A?Solution
ATQ, Total students = 30 + 25 + 35 = 90. Total marks (all) = 90 × 70 = 6300. Section B: marks = 25 × 68 = 1700 Section C: marks = 35 × 72 = 2520 Total (B + C) = 4220. Section A: marks = 6300 − 4220 = 2080. Average of A = 2080 / 30 ≈ 69.33.
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