Need help.....

1. Dr. Avila is doing a hands-on activity to demonstrate the predictive power of proportional reasoning. They have a 64 inch tall student stand outside at 11am on Monday and measure their shadow to be 48 inches long. Dr. Avila then tells their class that they will have a 72 inch tall student stand outside at 11am on Wednesday, and asks how tall this student's shadow will be. a. One student answers 56 inches long. How did they arrive at this answer? Does it appear that this student understands proportional reasoning? b. Another student answers 54 inches long. How did they arrive at this answer? Does it appear that this student understands proportional reasoning