- A72
- B65
- C68
- D70
Step-by-Step Solution
Total = ; first six = 288; last six = 330. The sixth number = 288 + 330 − 550 = 68.
Answer: C) 68
The average of 11 numbers is 50. The average of the first six numbers is 48 and that of the last six numbers is 55. Find the sixth number.
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
A batsman has an average of 45 runs in 10 innings. How many runs must he score in his…The sum of the present ages of a father and his son is 60 years. Six years ago the…A is 5 years older than B. Five years from now, the sum of their ages will be 55 years.…Six numbers written on a board have a mean of 38. Rahul rubs out the number 23. What is…Four cousins have an average age of 19 years. When a fifth cousin joins them, the…