Li Li lives on the 10th floor, and there are 20 steps between every two floors. If the power goes out, how many steps will she have to climb to get home?
李丽家住10楼，每两层楼之间有20级台阶，如果停电，她要上多少级台阶才能回家？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">20 * 9</gadget>
<output>180</output>

<result>180</result>