Xiaohua's family lives on the 7th floor of Unit 1 in Building A of Xingfu Community, and Grandma Wang lives on the 3rd floor of Unit 1 in Building A of Xingfu Community. Careful Xiaohua found that there are the same number of steps between every two floors. Xiaohua needs to walk 108 steps from the first floor to her home. How many steps does Grandma Wang have to walk from the first floor to her home?
小华家住在幸福小区A栋一单元的7楼，王奶奶家住在幸福小区A栋一单元的3楼．细心的小华发现每两层楼之间的台阶都是一样多，小华从一楼到家需要走108个台阶，王奶奶从一楼到家要走多少个台阶？
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">108 / 6</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>