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The average age of a group of 25 girls is 10year. If one girl, aged 12 years and 4 ...

The average age of a group of 25 girls is 10year. If one girl, aged 12 years and 4 months joins the group, find the new average age of the group

A. 10.1 years
B. 9.3 years
C. 8.7 years
D. 8 . 3 years




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