1. The problem is to calculate the division of 25.5 by 17. 2. Division means how many times 17 fits into 25.5. 3. Perform the division: $$\frac{25.5}{17} = 1.5$$ 4. This means 17 goes into 25.5 exactly 1.5 times. 5. Therefore, the answer is 1.5.