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?
Explanation:
Combined average = 80 = 70m+91nm+n
⇒ 80n + 80m = 70m + 91n
⇒ 10m = 11n
⇒ nm = 1011
Hence, option (d).
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