Average

JKSSB Class-IV & MTS · Mathematics · 38 practice questions with answers and explanations: 13 Easy, 14 Medium, 11 Hard.

Sample questions

Sample Easy question 1

Find the average of 11, 12, 13, 14 and 15.

  1. 12
  2. 13
  3. 14
  4. 15
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Answer: B. Sum = 65, average = 65/5 = 13.

Sample Medium question 2

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

Sample Hard question 3

The average age of a family of 5 members is 24 years. The youngest member is 8 years old. What was the average age of the family at the time of the youngest member's birth?

  1. 18
  2. 19
  3. 20
  4. 21
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Answer: C. Current sum = 120. 8 years ago, the other 4 members' combined age was (120-8) - 4×8 = 80, giving an average of 20.

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