pushpitkc wrote:
In the year 2010, the average age of children in a class of 20 was 12 years. In 2011, 10 more children
joined and the average age of the children became 14. What was the average age of these 10 children
in the year 2015?
A. 15
B. 16
C. 17
D. 18
E. 20
Source: Experts Global
if no new children were added to the class in 2011,
the average age of the original 20 children in 2011 would be 12+1=13
13*20=260 total years
adding 10 more children in 2011,
the average age of the total 30 children becomes
...
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