The average marks obtained by the boys and girls in a class are 52 and 42 respectively. If the average marks of all students in that class is 50, then - Mathematics MCQ General Knowledge 2026 | ExamTest.live

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The average marks obtained by the boys and girls in a class are 52 and 42 respectively. If the average marks of all students in that class is 50, then the percentage of boys present in the class is

Solution & Step-by-step Explanation

Let the number of boys be B and the number of girls be G . Using the weighted average formula: \frac{52 B + 42 G}{B + G} = 50 52 B + 42 G = 50 B + 50 G 52 B - 50 B = 50 G - 42 G 2 B = 8 G \frac{B}{G} = \frac{4}{1} The ratio of boys to girls is 4 : 1 . The percentage of boys in the class is: \frac{B}{B + G} \times 100 = \frac{4}{4 + 1} \times 100 = \frac{4}{5} \times 100 = 80%

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The average marks obtained by the boys and girls in a class are 52 and 42 respectively. If the average marks of all students in that class is 50, then the percentage of boys present in the class is

40%

50%

80%

Can’t be determined from above data.

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