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In a class there are 90 students. 30 of them are boys. Their average mark in a test is 75. The average mark of the girls in the test is 90. Find the average mark of the class in the test.

A.	83	B.	85
C.	87	D.	86

Answer and Explanation

Answer:85

Explanation:
The no of girls in the class are 60.
Total marks of the boys = (30)(75) = 2250
Total marks of the girls = (5)(60) = 5400
Total marks of the class = 7650
Average marks of the class in the test = 7650/90 = 85

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