general math MCQ #752

If x² - y² = 28 and x - y = 8, what is the average of x and y?

general math MCQ #752

  1. Question 1

    Q1. If x² - y² = 28 and x - y = 8, what is the average of x and y?

    • A) 3.5
    • B) 1.75
    • C) 7
    • D) 8

    Answer: 1.75

    Explanation: (x−y)(x+y) = 28 and x−y = 8, so x+y = 3.5; the average = (x+y)/2 = 1.75.