On each kilometer of the highway between the villages of Yolki and Palki, there is a post with a sign. On one side of the sign, it says how many kilometers it is to Yolki, and on the other side - to Palki. A Thoughtful Observer noticed that on each post, the sum of these numbers is 13. What is the distance from Yolki to Palki?

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Note: On each post, one number shows the distance from the post to Yolkin, and the other number shows the distance from the post to Palkin.

## Solution

On each post, one number shows the distance from the post to Yolkin, and the other number shows the distance from the post to Palkin. Therefore, the distance from Yolkin to Palkin is equal to the sum of the numbers on the post, i.e., 13 km.

## Answer

Problem