A) 61.50%
B) 51.25%
C) 40.50%
D) 51.52%
Correct Answer: B
Solution :
No. of boys in a school = 90 Mean marks of boys \[=45%\] Total mark of 90 boys \[=90\times 45=4050\] No. of girls in a girls \[=70%\] \[\therefore \]Total marks of 30 girls \[\text{Total}=30\times 70\] \[=2100\] Total marks secured by 90 boys and 30 Girls \[=4050+2100=6150\] No. of boys and girls in a school \[=90+30=120\] \[\therefore \]Average marks % of school \[=\frac{6150}{120}=51.25%\]
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