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The average of marks scored by the students of a class is 68. The average of the girls in the class is 80 and that of boys is 60. What is the percentage of boys in the class?

A40 %

B60 %

C65 %

D70 %

Answer:

B. 60 %

Read Explanation:

Let there be x boys and (100-x) girls. Then 60x+80 (100-x)=6800 20x = 1200 X = 60 percentage of boys = 60%


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