The average age of a group of 10 students was 18. 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?
Answer with explanationAnswer: Option C
The average age of a group of 10 students is 18.
Therefore, the sum of the ages of all 10 of them = 10 * 18 = 180
When two students joins the group, the average increase by 1. New Average = 19
Now there are 12 students Therefore, sum of all the ages of 12 students = 12 X 19 = 228
Therefore, the sum of the ages of two students who joined = 228 – 180 = 48
And the average age of these two students = 24
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