Building B where Jianjian lives has the same number of steps between every two floors. He walked a total of 24 steps from the first floor to the third floor. His family lives on the 5th floor. How many steps does he have to walk home from the 1st floor?
健健住的B幢楼，每两层楼间台阶一样多．他从1楼走到3楼共走了24级台阶．他家住在5楼，他从1楼走回家一共要走多少级台阶．
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>