Two classes M and N have average marks 25 and 40 respectively, the overall average obtained is 30. The ratio of the students in the class M and N is:
Answer & explanation
Correct answer: option 1
Let sum of marks of class M = 25m
Sum of marks of class N = 40n
According to question ,
\(\frac{25m + 40n }{m + n }\) = 30
25m + 40n = 30 m + 30n
5m = 10n
Ratio of students in class M to class N = 2 : 1