Solve Average Practice Questions with Answers in Quantitive Aptitude Section for Sarkari Exams. Here you can easily understand and expert the in averages subject. We added from beginners to advanced level Average Problems with Solutions.
Q61. If the average of 8 numbers is 20 and the average of 4 other numbers is 30, what is the average of all 12 numbers?
Correct Answer:
22.5
Explanation: Total sum of 8 numbers = 20 × 8 = 160.
Total sum of 4 numbers = 30 × 4 = 120.
Combined total = 160 + 120 = 280.
Combined average = Total sum / Total count = 280 / 12 = 22.5.
Q62. The average of 10 numbers is 8. If one of the numbers is excluded, the average becomes 7.2. What is the excluded number?
Correct Answer:
14
Explanation: Total sum of 10 numbers = Average × Count = 8 × 10 = 80.
Total sum of 9 numbers = Average × Count = 7.2 × 9 = 64.8.
Excluded number = Total sum of 10 - Total sum of 9 = 80 - 64.8 = 14.
Q63. A batsman’s average score for 10 innings is 50 runs. If his scores in the first 9 innings total 450 runs, what was his score in the 10th innings?
Correct Answer:
50
Explanation: Total score for 10 innings = Average × Count = 50 × 10 = 500 runs.
Score in 10th innings = Total score - First 9 innings = 500 - 450 = 50 runs.
Q64. The average weight of 4 boys is 50 kg. If a new boy joins the group, the average becomes 48 kg. What is the weight of the new boy?
Correct Answer:
45 kg
Explanation: Total weight of 4 boys = 50 × 4 = 200 kg.
Total weight of 5 boys = 48 × 5 = 240 kg.
Weight of new boy = 240 - 200 = 45 kg.
Q65. The average of three numbers is 24. If two of the numbers are 18 and 30, what is the third number?
Correct Answer:
24
Explanation: Total Sum = Average × Count = 24 × 3 = 72.
Third number = Total Sum - Sum of first two = 72 - (18 + 30) = 24.
Q66. If the average of 4 numbers is 10, what is their total sum?
Correct Answer:
40
Explanation: Total Sum = Average × Number of terms = 10 × 4 = 40.
Q67. What is the average of 2, 4, 6, 8, and 10?
Correct Answer:
6
Explanation: Average = (Sum of terms) / (Number of terms) = (2 + 4 + 6 + 8 + 10) / 5 = 30 / 5 = 6.