Beibei is going to grandma's house. There is a lamppost in front of his house. Starting from this pole, he counts as he walks. There is a lamppost every 50 steps. When he counts to the 10th one, he arrives at grandma's house. How far has he walked in total? step.
贝贝要去外婆家，他家门口有一根路灯杆，从这根杆开始，他边走边数，每50步有一根路灯杆，数到第10根时刚好到外婆家，他一共走了多少步．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">50 * 9</gadget>
<output>450</output>

<result>450</result>