Total sum = number count × average.<br><br>
• Original total of 6 numbers = 6 × 24 = 144<br>
• New total of 6 numbers = 6 × 28 = 168<br>
• Increase in total = 168 − 144 = 24<br>
• Doubling a number adds its original value once.<br>
• So the original number = 24<br><br>
Final Answer: 24