Question 87

The total of the ages of a class of 75 girls is 1050 years the average age of 25 of them is 12 years and that of another 25 is 16 years Find the average age of the remaining girls

Solution

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Let there be three groups of 25 girls each having averages a, b and c.
25a+25b+25c=1050
a+b+c=42
Now, a = 12 and b = 16
hence, c = 14
Therefore average age of remaining 25 girls = c = 14 years.
Hence, option C is correct option.

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