In a class of 100 students, the average age is 16 years. If the number of girls is increased by half of its previous number and the number of boys becomes ${\frac{2}{3}}^{r d}$ of its previous number, the total number of students remained unchanged. It was observed the average age of boys and girls was not changed and the new total average was 15. Find the average age of girls now?

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Solution

The correct option is C 13
Option (C) is the correct answer. Check the video for the approach.

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The correct option is C 13Option (C) is the correct answer. Check the video for the approach.

The correct option is C 13
Option (C) is the correct answer. Check the video for the approach.