Xiaofang's family lives on the seventh floor of Mingyue Building, where there are 17 steps between every two floors. Xiaohong's house lives downstairs from Xiaofang's house. Xiaofang can walk down 85 steps from her house to Xiaohong's house. How many floors does Xiaohong's house live in?
小芳家住在明月楼的7层，该楼每两层的楼间距都是17级台阶．小红家住在小芳家的楼下，小芳从家往下走85级台阶可以到小红家，则小红家住在多少层．
<gadget id="calculator">85 / 17</gadget>
<output>5</output>

<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<result>2</result>