The tourists walked 20 km. On the first day, they covered one fifth of the entire journey

The tourists walked 20 km. On the first day, they covered one fifth of the entire journey, on the second day, one fourth, and the rest of the journey on the third day. How many kilometers did they walk on the third day?

Method 1.
1. Let’s find out what part of the way the tourists went in the first two days:
1/5 + 1/4 = 4/20 + 5/20 = 9/20.
2. Find out what part of the way the tourists went on the third day:
1 – 9/20 = 20/20 – 9/20 = 11/20.
3. Let’s answer the question of the problem:
11/20 * 20 = 11 km.
Method 2.
1. The first step is the same as in the previous method.
2. Find out how many kilometers the tourists covered in the first two days:
20 * 9/20 = 9 km.
3. Let’s answer the question of the problem:
20 – 9 = 11 km.
Answer: 11 km.