Xiaoming and Xiaoying live in the same building, Xiaoming lives on the 17th floor, Xiaoying lives on the 6th floor, Xiaoming has to walk 240 steps to go home every day, the number of stairs between two adjacent floors in the building is the same, ask Xiaoying how to go home How many stairs do you take?
小明与小英住同一幢楼，小明住17楼，小英住6楼，小明每天回家要走240级楼梯，大楼内相邻两层之间的楼梯级数相同，问小英回家要走多少级楼梯？
<gadget id="calculator">17 - 1</gadget>
<output>16</output>

<gadget id="calculator">240 / 16</gadget>
<output>15</output>

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

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>