Question 1179762
Let's break down this roller coaster problem step-by-step:

**1. How many more rows were filled on the first train than on the third train?**

* First train: 7 1/4 rows = 7.25 rows
* Third train: 5 1/2 rows = 5.5 rows
* Difference: 7.25 - 5.5 = 1.75 rows

**Answer:** 1.75 more rows were filled on the first train than the third train.

**2. How many rows were empty on the first train? How many additional riders would it take to fill the empty rows? Explain your answer.**

* Total rows per train: 8
* Rows filled on the first train: 7 1/4 rows = 7.25 rows
* Empty rows: 8 - 7.25 = 0.75 rows

* Riders per row: 4
* Additional riders needed: 0.75 rows * 4 riders/row = 3 riders

**Answer:** 0.75 rows were empty on the first train. It would take 3 additional riders to fill the empty rows.

**Explanation:** Since there are 4 riders per row, and 0.75 of a row is empty, we multiply 0.75 by 4 to find the number of riders needed to fill the empty space.

**3. How many rows were empty on the third train? How many additional riders would it take to fill the empty rows? Explain your answer.**

* Total rows per train: 8
* Rows filled on the third train: 5 1/2 rows = 5.5 rows
* Empty rows: 8 - 5.5 = 2.5 rows

* Riders per row: 4
* Additional riders needed: 2.5 rows * 4 riders/row = 10 riders

**Answer:** 2.5 rows were empty on the third train. It would take 10 additional riders to fill the empty rows.

**Explanation:** Since there are 4 riders per row, and 2.5 rows are empty, we multiply 2.5 by 4 to find the number of riders needed to fill the empty space.