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Five years ago, the average age of 4 gir...

Five years ago, the average age of 4 girls was 7 years. After including a new girl, the present average age becomes 13 years. The present age of the new girl is :
पाँच वर्ष पहले 4 लड़कियों की औसत आयु 7 वर्ष थी | एक नई लड़की के शामिल होने पर वर्तमान औसत आयु 13 वर्ष हो जाती है | नई लड़की की वर्तमान आयु है :

A

14 years / 14 वर्ष

B

19 years / 19 वर्ष

C

16 years / 16 वर्ष

D

17 years / 17 वर्ष

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