issb mathematics MCQ #351

A does work in 15 days, B in 30 days. Together in?

issb mathematics MCQ #351

  1. Question 1

    Q1. A does work in 15 days, B in 30 days. Together in?

    • A) 8 days
    • B) 10 days
    • C) 12 days
    • D) 20 days

    Answer: 10 days

    Explanation: Rates 1/15 plus 1/30 equals 1/10 so 10 days together. Work each step carefully; ISSB math rewards accuracy under time pressure.