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