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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
C.18
D.21
Answer and Feedback
Answer:B
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

Questions in to this exercise. Do you want test?

Practice Averages Online Test 6 | Englishfreetest.com

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