Question
In a class of 30 students, the average marks are 68. The
average marks of 18 boys is 72. What is the average marks of the 12 girls?Solution
ATQ, Total marks of all 30 students = 30 × 68 = 2040 Total marks of 18 boys = 18 × 72 = 1296 Total marks of 12 girls = 2040 − 1296 = 744 Average of girls = 744 / 12 = 62
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