Average

J&K Bank PO · Quantitative Aptitude · 118 practice questions with answers and explanations: 60 Easy, 56 Medium, 2 Hard.

Sample questions

Sample Easy question 1

What is the average of the numbers 46, 16, 35, 50, 38?

  1. 39
  2. 37
  3. 38
  4. 36
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Answer: B. Sum = 185; average = 185/5 = 37.

Sample Easy question 2

The average of 5 numbers is 34. If 4 of them are 13, 43, 11, 14, what is the remaining number?

  1. 34
  2. 89
  3. 84
  4. 94
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Answer: B. Total = 34 × 5 = 170; remaining = 170 − 81 = 89.

Sample Easy question 3

What is the average of 7 consecutive integers starting from 7?

  1. 13
  2. 7
  3. 10
  4. 11
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Answer: C. The average of consecutive integers is the middle one: 7 + 3 = 10.

Sample Medium question 4

A class of 25 students has an average score of 55. Another class of 15 students has an average score of 75. Find the combined average.

  1. 62
  2. 63
  3. 62.5
  4. 61
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Answer: C. Combined total = 25×55 + 15×75 = 1375+1125 = 2500. Combined average = 2500/40 = 62.5.

Sample Medium question 5

The average weight of 10 people increases by 3 kg when a person weighing 60 kg is replaced by a new person. Find the weight of the new person.

  1. 88
  2. 90
  3. 85
  4. 92
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Answer: B. Total weight increases by 10 × 3 = 30 kg. New person's weight = 60 + 30 = 90 kg.

Sample Medium question 6

The average age of a family of 5 members is 26 years. If a 10-year-old child is not counted, find the average age of the remaining 4 members.

  1. 29
  2. 30
  3. 32
  4. 31
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Answer: B. Total age = 5×26 = 130. Excluding the child: (130-10)/4 = 30.

Sample Hard question 7

The average of 11 numbers is 50. The average of the first 6 is 49 and of the last 6 is 52. Find the 6th number.

  1. 55
  2. 54
  3. 56
  4. 57
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Answer: C. Sum of all 11 = 550, first 6 sum = 294, last 6 sum = 312. The 6th number is counted in both: 294 + 312 - 550 = 56.

Sample Hard question 8

The average of 12 numbers is 18. If the average of the first 7 is 20 and the average of the last 6 is 15, find the 7th number.

  1. 15
  2. 17
  3. 14
  4. 16
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Answer: B. Total of 12 = 216. First 7 total = 140, last 6 total = 90. 7th number is counted in both groups, so 140 + 90 - 216 = 14 — the 7th number is 14.

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