There are 18 steps to go up each floor, and 90 steps to go from the first floor to Lily's house. How many floors does Lily's house live on?
每上一层楼要走18级台阶，从一楼到莉莉家要走90级台阶，莉莉家住在多少楼．
<gadget id="calculator">90 / 18</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>