15. (6 points) Xiao Wang's home is 750 meters away from the school. One morning, he went to school from home, and when he had walked about half the total distance, he realized he had forgotten to bring his red scarf. So he went back to get it and then went to school again. How many meters did Xiao Wang walk to school that morning in total?
【Answer】Solution: $750+750=1500$ (meters)
Answer: Xiao Wang walked approximately 1500 meters to school in total.