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Question

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 B 51.25%
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%

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