Xiaoyang and Xiaodan live in the same building, Xiaoyang lives on the sixth floor, Xiaodan lives on the third floor, Xiaoyang has to walk 100 steps to go home every day, how many steps does Xiaodan take to go home.
小阳与小丹住同一幢大楼，小阳住六楼，小丹住三楼，小阳每天回家要走100级台阶，小丹回家要走多少级台阶．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<result>40</result>