Average age of nine males is 12, and the average age of x number of females is 13.The average age of both males and females is 12.5. Find the number of females

Average age of nine males is 12, and the average age of x number of females is 13.The average age of both males and females is 12.5. Find the number of females
1). 14
2). 12
3). 9
4). 10

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