There are 15 steps to go up each floor, and 90 steps to walk from the first floor to Xiaoying's house. How many floors does Xiaoying's house live on?
每上一层楼要走15个台阶，从一楼走到小英家要走90个台阶，小英家住多少楼．
<gadget id="calculator">90 / 15</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>