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.

12yr
10yr
16yr
10.5 yr.

Correct Answer: 10yr

Explanation:

Total age of 30 girls = 30 x 13 = 390 yr
Total age of 18 girls = 18 x 15 = 270 yr.
∴ Age of remaining 12 girls = 390 - 270 = 120 yr
∴ Required average = 120/12 = 10 yr

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