Answer & ExplanationOption: [A]
The total age of first 25 girls is 25 x 13 = 325 year
The total age of second 25 girls is 25 x 16 = 400 year
The total age of first 50 girls = 725 year
The number of girls remained to calculate 30
So the total age of these 30 girls is (1070-725) year = 270 year
270/30 = 9 year
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