Question

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?
(a) 11/10 b (b) 13/10
(c) 10/13
(d) 10/11​

Answer 1

Answer:

option d.

Step-by-step explanation:

total score of m students = 70m

total score of n students = 91n

70 m + 91 n / m+n = 80

70 m + 91 n = 80m + 80n

91 n - 80 n = 80m - 70m

11n = 10m

n/m = 10/11