- A39
- B21.5
- C38.5
- D40
Step-by-Step Solution
New total for 36 people = ; apprentices' total = . Instructor = 774 − 735 = 39 years.
Answer: A) 39
A batch of 35 apprentices has an average age of 21 years. When the instructor is counted too, the average rises by half a year. How old is the instructor?
Competition practiceAverages & Ages
Master this topic in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Averages & Ages practice questions
More Averages & Ages practice
Seven parcels weigh 18 kg on average. When one parcel is taken out, the average of the…In a class of 24 children the average age is 11 years. When the class teacher's age is…What is the average of all the even numbers from 2 to 40?The sum of the present ages of a mother and her daughter is 50 years. Five years ago,…Seven numbers have an average of 53. If the number 29 is taken out, what is the average…