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# Quantitative Aptitude :: Average - Discussion

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## A class consists of 20 boys and 30 girls. In the mid-semester examination, the average score of the girls was 5 higher than that of the boys. In the final exam, however, the average score of the girls dropped by 3 while the average score of the entire class increased by 2. The increase in the average score of the boys is

A9.5

B10

C4.5

D6

Show Explanation

20x+b+30(x+2)=50(x+(3+2))

20x+30x+60+b=50x+250

50x-50x+b=250-60

b=190/20

b=9.5