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In a class of 180 students, how many girls scored over 70% in the Chemistry test ? I. Exactly 15 boys scored over 70% in the test. II. 2/3 rd of the class scored over 70% in the test.

In a class of 100 students, there are 70 boys whose average marks in a subject is 75. If the average marks of the complete class is 72, then what is the average of the girls ?

The mean of he marks in Statistics of 100 students in a class was 72 . The mean of marks for boys was 75, while their number was 70. The mean of marks of girls in the class was

In a class of 100 students, there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average marks of the girls ?

The average of the test scores of a class of m students is 70 and that of n students is 91. When the scores of both the classes are combined, the average is 80. What is n/m?