Did you know what needs to be done in order to become a sheriff of the Wild West? You need to know the math and pass this magnificent test for knowledge of completely non-complex examples. Today you have such an opportunity to try yourself for the role of sheriff and actually learn how he became Kelly. All you need is to answer math questions: yes or no. An example will be placed at the top, and the answer option next to it - after the equal sign. If the answer is correct - you click on the green light, if not true on red! Everything is quite simple, but still stay attentive and learn to quickly count, as the time counter will also be inherent in this game. And which of you is the sheriff?