Exams › IBPS PO › Quantitative Aptitude

The total of the ages of a class of 60 girls is 900 years. The average age of 20 girls is 12 years and that of another 20 girls is 16 years. What is the average age of the remaining girls?

1. 14 years
2. 15 years
3. 16 years
4. 17 years

Correct answer: 17 years

Solution

The total age of 20 girls is 20 \times 12 = 240 years, and for another 20 girls it is 20 \times 16 = 320 years. Together they sum to 560 years, so the remaining 20 girls have 900 - 560 = 340 years. Their average age is 340/20 = 17 years.

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