• Home
  • The average age of a group of 10 students was 10.
Question 1:
The average age of a group of 10 students was 10. 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. 8
B. 16
Feedback The average age of a group of 10 students is 10.
Therefore, the sum of the ages of all 10 of them = 10 * 10 = 100
When two students joins the group, the average increase by 1.
New Average = 11
Now there are 12 students
Therefore, sum of all the ages of 12 students = 132
Therefore, the sum of the ages of two students who joined = 132 - 100 = 32
And the average age of these two students = 16
C. 18
D. 21

These questions are from this test. Would you like to take a practice test?

Practice Averages Online Test 6 | Englishfreetest.com