Average Questions Answers

• 8. Average of first five multiples of 3 is

  1. 9
  2. 11
  3. 13
  4. 15

  Answer And Explanation

  Answer: Option A

  Explanation:

  \begin{aligned}
  Average = \frac{3(1+2+3+4+5)}{5} = \frac{45}{5} = 9
  \end{aligned}

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• 9. Average age of boys in a class is 16 years and average age of girls is 15 years, what is the average age of all

  1. 15.5
  2. 15
  3. 16
  4. Cant be computed

  Answer And Explanation

  Answer: Option D

  Explanation:

  As number of girls and boys is not given so result cant be computed

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• 10. A library has an average of 510 visitors on Sundays and 240 on other day. The average number of visitors in a month of 30 days starting with sunday is

  1. 280
  2. 285
  3. 290
  4. 295

  Answer And Explanation

  Answer: Option B

  Explanation:

  As the month begin with sunday, so there will be five sundays in the month. So result will be:
  \begin{aligned}
  = (\frac{510 \times 5 + 240 \times 25}{30})
  = (\frac{8550}{30}) = 285
  \end{aligned}

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• 11. A batsman makes a score of 87 runs in the 17th match and thus increases his average by 3. Find his average after 17th match

  1. 36
  2. 37
  3. 38
  4. 39

  Answer And Explanation

  Answer: Option D

  Explanation:

  Let the average after 17th match is x
  then the average before 17th match is x-3
  
  so 16(x-3) + 87 = 17x
  => x = 87 - 48 = 39

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• 12. Average weight of 10 people increased by 1.5 kg when one person of 45 kg is replaced by a new man. Then weight of the new man is

  1. 50
  2. 55
  3. 60
  4. 65

  Answer And Explanation

  Answer: Option C

  Explanation:

  Total weight increased is 1.5 * 10 = 15.
  So weight of new person is 45+15 = 60

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• 13. Average of five numbers is 27. If one number is excluded the average becomes 25. The excluded number is

  1. 35
  2. 45
  3. 55
  4. 65

  Answer And Explanation

  Answer: Option A

  Explanation:

  Number is (5*27) - (4*25) = 135-100 = 35

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• 14. The average score of a cricketer for ten matches is 38.9 runs. If the average for first six matches is 42, then average for last four matches is

  1. 33.25
  2. 32.25
  3. 34.25
  4. 34.50

  Answer And Explanation

  Answer: Option C

  Explanation:

  \begin{aligned}
  = \frac{(38.9 \times 10)-(42 \times 6)}{4}
  \end{aligned}
  
  \begin{aligned}
  = \frac{(1216 - 750)}{4} = 34.25
  \end{aligned}

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