issb mathematics MCQ #399

issb mathematics MCQ #399

1. Question 1

   Q1. Average of 5 and 15?

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

   Answer: 10

   Explanation: Sum 20 divided by 2 equals 10. Work each step carefully; ISSB math rewards accuracy under time pressure.