In a class of 50 students, 40% are girls. The average marks of the whole class are 64.4 and the average of the boy’s marks is 62. What is the average mark of the girls?

In a class of 50 students, 40% are girls. The average marks of the who

1.	In a class of 50 students, 40% are girls. The average marks of the whole class are 64.4 and the average of the boy’s marks is 62. What is the average mark of the girls?
A.	67
B.	66.8
C.	68
D.	66.4
Answer» D. 66.4

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In a class of 50 students, 40% are girls. The average marks of the whole class are 64.4 and the average of the boy’s marks is 62. What is the average mark of the girls?

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