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The total of the ages of a class of 60 girls is 900 years. The average age of 20 of the girls is 12 years and that of the other 20 girls is 16 years. What is the average age of the remaining girls?

1:
14 years
2:
15 years
3:
16 years
4:
17 years
5:
none of these
Solution:
Chapter Name: Average


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