From a school, 90 boys and 30 girls appeared for a public examination. The average marks of boys is found to be 45% whereas the average marks of girls is 70%. What is the school average?
A
61.50%
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B
51.25%
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C
40.50%
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D
51.52%
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Solution
The correct option is B51.25% Number of boys = 90 Average marks of boys =45% Total marks of 90 boys =90×45=4050 Number of girls = 30 Average marks of girls =70% ∴ Total marks of 30 girls =30×70=2100 Total marks secured by 90 boys and 30 girls = 4050 + 2100 = 6150 Number of boys and girls = 90 + 30 = 120 ∴ Average marks of the school =6150120=51.25%