When a positive integer n is divided by 5, the remainder is 3. What is the remainder when 3n is divided by 5?

✓ Correct Answer: Option D

If n divided by 5 gives a remainder of 3, then n can be expressed as 5k + 3. So, 3n = 3(5k + 3) = 15k + 9. When 15k is divided by 5, the remainder is 0. When 9 is divided by 5, the remainder is 4. Therefore, the remainder when 3n is divided by 5 is 4.