question_answer

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 What is n/m?

A)  \[11/10\]                      

B)  \[13/10\]

C)  \[10/13\]            

D)       \[10/11\]