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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 combinde, the average is 80. What is n/m ?
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- 11/10
- 13/10
- 10/13
- 10/11
Correct Option: D
According to the question,
70m + 91n = 80 (m + n)
⇒ 70m + 91n = 80m + 80n
⇒ 10m = 11n
⇒ n/m = 10/11
