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
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Answer:
total students = 90
boys = 30 and girls= 60
average marks of boys = 75
average marks of girls = 90
average = 75+90/2
=
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