Final answer:
There are 15 empty seats on the train.
Step-by-step explanation:
To find the number of empty seats on the train, we first need to calculate 20% of the total number of seats. To do this, we multiply 75 by 20% which is equal to 0.2. 0.2 * 75 = 15. So there are 15 empty seats on the train.
Learn more about Calculating empty seats on a train