issb mathematics MCQ #357

Average age of 3 persons 20, 30, 40?

issb mathematics MCQ #357

  1. Question 1

    Q1. Average age of 3 persons 20, 30, 40?

    • A) 25
    • B) 30
    • C) 35
    • D) 40

    Answer: 30

    Explanation: Sum 90 divided by 3 gives average 30. Work each step carefully; ISSB math rewards accuracy under time pressure.