Multiple choice

The average age of 30 boys in a class is 15 years. One boy aged 20 years leaves the class, but two new boys, whose ages differ by 5 years, replace him. If the average age of all the boys now in the class is still 15 years, then find the age of the younger of the two new boys.

  1. 12.5 years

  2. 20 years

  3. 10 years

  4. 15 years

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer

Keep practicing — related questions