In a class of 30 students, 10 members of Physics main have average of 72 marks, 5 members of Chemistry main have average of 66 marks and 15 members of Mathematics main have average of 80 marks. The average marks of the class is:

In a class of 30 students, 10 members of Physics main have average of

1.	In a class of 30 students, 10 members of Physics main have average of 72 marks, 5 members of Chemistry main have average of 66 marks and 15 members of Mathematics main have average of 80 marks. The average marks of the class is:
A.	69
B.	70
C.	74
D.	75
Answer» E.

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In a class of 30 students, 10 members of Physics main have average of 72 marks, 5 members of Chemistry main have average of 66 marks and 15 members of Mathematics main have average of 80 marks. The average marks of the class is:

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