Question

the average marks obtained in an exam by two groups of students were found to be 75 and 85 respectively determine the ratio of the students in the two group if the average marks of all the student was 80 ​

Answer 1

Answer:

Step-by-step explanation:

75:85

Answer 2

The ratio of the students in the two group is 1:1.

Step-by-step explanation:

Since we have given that

Average marks of first group = 75

Average marks of second group = 85

Total average of both the groups = 80

So, we will use "Mixture and allegation":

 75                            85

                 80

----------------------------------------------

85 - 80      :      80 - 75

    5            :         5

=   1            :          1

Hence, the ratio of the students in the two group is 1:1.

# learn more:

The average marks obtained in an exam by two groups of students was found to be 75 and 85 respectively. Determine the ratio of students in the two groups, if the average mark for all students was 80.

https://brainly.in/question/4629514