Average Practice Test 6

Question : 1 of 40

Marks: +1, -0

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?

11/10
13/10
10/13
10/11

Validate

Solution:

Average of test score of class m student = 70
Total score = 70m
Average of class n student = 91
Total score = 91n
Average of the combined class = (m + n) = 80
Total score = (m + n) 80
According to the statement,
70m + 91n = 80 (m + n)
70m + 91n = 80m + 80n
91n - 80n = 80m - 70m
11n = 10m

n/m=10/11

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