Which fraction below represents three and four-fifths?

The fraction that represents three and four-fifths is 19/5. Here's how you get that:

1. First, convert the whole number (3) into a fraction. Any whole number can be written as itself over 1, so 3 becomes 3/1.

2. Then, convert the fraction (4/5) into a fraction with the same denominator as the whole number fraction. Since the denominator is already 1, you don't need to do anything to 4/5.

3. Now, add the two fractions together. To add fractions, you add the numerators (the top numbers) and keep the denominator (the bottom number) the same. So, 3/1 + 4/5 becomes 15/5 + 4/5.

4. Add the numerators together to get 19/5.

So, three and four-fifths is represented as 19/5.