issb mathematics MCQ #304

If 5:x = 15:21, x is:

issb mathematics MCQ #304

  1. Question 1

    Q1. If 5:x = 15:21, x is:

    • A) 5
    • B) 7
    • C) 9
    • D) 11

    Answer: 7

    Explanation: Cross multiply: 5 times 21 equals 15x, so 105 equals 15x and x is 7.