2020 · Q115
The average age of the boys in a class is 12 years. The average age of the girls in the class is 11 years. There are 50% more girls than boys in the class. Which one of the following is the average age of the class (in years)?
general-mental-abilityquantitative-aptitude
- A11.2 years
- B11.4 years
- C11.6 years
- D11.8 years
Explanation
With 50% more girls than boys, take 2 boys and 3 girls: the class average = (2×12 + 3×11)/5 = 57/5 = 11.4 years.