The average age of 30 girls is 13 yr. The average of first 18 girls is 15 yr. Find out the average age of remaining 12 girls.
Correct Answer: Description for Correct answer:
Total age of 30 girls = \( \Large 30 \times 13 \) = 390 yr
Total age of 18 girls = \( \Large 18 \times 15 \) = 270 yr
Therefore, Age of remaining 12 girls
= 390 - 270 = 120 yr .
Therefore, Required average = \( \Large \frac{120}{12} \) = 10 yr
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