# Averages Problems for SSC CGL

21.

There were 20 students in a particular Class. The class teacher knows the overall height of all the students in the class is 1300. Can you find the average height of students in the class?

A.) 65
B.) 71.5
C.) 68.25
D.) 61.75

Use the below formula to find the average height of students in the class Average Height = ( Total Height of all students in the Class / Total Number of Students) Average Height = ( 1300/20) = 65

22.

The average of 8 numbers is zero. Of them, at the most how many may be greater than zero?

A.) 4
B.) 6
C.) 7
D.) 8

Average of 8 numbers is = 0
Therefore sum of all 8 numbers = 0
It is quite possible that 7 of these numbers may be positive and if their sum is "a" then 8th number is "(-a)".

23.

In the first 10 overs of a cricket game, the run rate was only 8.2. What should be the run rate in the remaining 40 overs to reach the target of 106 runs?

A.) 0.66
B.) 0.6
C.) 0.82
D.) 0.54

Required Run rate = ( 106 - ( 8.2 x 10 ) )/ (40) = ( 24) /(40) = 0.6

24.

The average of marks of a student of 8 exams was 35. How many marks must be get in the next exam so as to increase his average of marks by 5?

A.) 75
B.) 80
C.) 83
D.) 79

80

25.

The average age of a group of 10 students was 14. The average age increased by 1 years when two new students joined the group. What is the average age of the two new students who joined the group?

A.) 20
B.) 20.5
C.) 21.5
D.) 19

The average age of a group of 10 students is 14.
Therefore, the sum of the ages of all 10 of them = 10 * 14 = 140
When two students joins the group, the average increase by 1. New Average = 15
Now there are 12 students
Therefore, sum of all the ages of 12 students = ( 12 X 15 ) = 180
Therefore, the sum of the ages of two students who joined = 180 - 140 = 40
And the average age of these two students =20