Multiple choice

Find the correct relationship between given quantities. Quantity I: Average, if 43 years old teacher join in a class of 22 students, whose average age is 20 years. Quantity II: Average, if average age of 5 member’s family was 38 years before 70 years old grandfather’s death and a new baby born in family.

  1. Quantity I > Quantity II

  2. Quantity I ≥ Quantity II

  3. Quantity II > Quantity I

  4. Quantity II ≥ Quantity I

  5. Quantity I = Quantity II or Relation cannot be established
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Quantity I: With 22 students averaging 20 years, total age = 440. Adding 43-year teacher gives total 483 for 23 people, so average = 483/23 = 21 years. Quantity II: 5-member family with average 38 means total = 190. After 70-year grandfather dies, total becomes 120 for 4 people. New baby (age 0) makes total 120 for 5 people, average = 120/5 = 24 years. Since 24 > 21, Quantity II is greater.

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