Xiaoqiang and Xiaohui live in the same building. Xiaohui lives on the 6th floor and Xiaoqiang lives on the 3rd floor. Xiaohui has to walk 90 steps to go home every day. How many steps does Xiaoqiang take to go home?
小强和小辉同住一幢大楼里，小辉住6楼，小强住3楼，小辉每天回家要走90级楼梯，小强回家要走多少级楼梯．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">90 / 5</gadget>
<output>18</output>

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

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>