Four standard dice are thrown on the ground. The total of numbers on the top faces of these four dice is 13. What is the total of the numbers on the bottom faces?

Correct answer: 15

Explanation: ✅ Correct Answer: C) 15 📚 Explanation: In any standard die, the sum of the numbers on any two opposite faces is always exactly 7. For four standard dice, the total sum of all opposite face pairs (top plus bottom) is 4 multiplied by 7, which strictly equals 28. If the top faces sum to 13, the bottom faces must sum to 28 minus 13, which equals 15.