issb mathematics MCQ #560

A alone 20 days, B alone 30 days. Together?

issb mathematics MCQ #560

  1. Question 1

    Q1. A alone 20 days, B alone 30 days. Together?

    • A) 10 days
    • B) 11 days
    • C) 12 days
    • D) 15 days

    Answer: 12 days

    Explanation: Rates 1/20 plus 1/30 equals 1/12 so 12 days together. Apply the same method to similar ISSB quantitative items.