Averages
8 questions · EasyMediumHard
The average (mean) is the total divided by the count. Most average questions are really total questions: turn every average into a total, then compare totals.
💡 Quick tricks
- Total = average × number of items.
- When a new value joins, compare the totals before and after: new value = new total − old total.
- If every value goes up by k, the average goes up by k.
🎯 Try it yourself
Tap an answer. You'll see if it's right, and why. Easy ones come first.
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Q1Easy
What is the average of 10, 33 and 23?
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Answer: D. 22
💡 Sum = 66, and 66 ÷ 3 = 22.
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Q2Easy
What is the average of 31, 17 and 21?
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Answer: C. 23
💡 Sum = 69, and 69 ÷ 3 = 23.
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Q3Easy
What is the average of 11, 27 and 10?
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Answer: D. 16
💡 Sum = 48, and 48 ÷ 3 = 16.
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Q4Medium
What is the average of 69, 92, 53, 25 and 31?
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Answer: C. 54
💡 Sum = 270, and 270 ÷ 5 = 54.
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Q5Medium
Average age of 19 students is 14. With the teacher it becomes 16. Teacher's age?
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Answer: B. 54
💡 Total with teacher = 16 × 20 = 320. Students = 14 × 19 = 266. Teacher = 54.
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Q6Medium
What is the average of 64, 46, 71, 60 and 79?
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Answer: B. 64
💡 Sum = 320, and 320 ÷ 5 = 64.
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Q7Hard
The average of 5 numbers is 39. Four of them are 44, 52, 54 and 39. Find the fifth.
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Answer: D. 6
💡 Total = 5 × 39 = 195. Known sum = 189. Fifth = 195 − 189 = 6.
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Q8Hard
Vikram averages 55 runs in 13 innings. Runs needed next to make it 56?
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Answer: D. 69
💡 Needed total = 56 × 14 = 784; current total = 55 × 13 = 715; so 69 runs.
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