A and B compete to climb the stairs. When A reaches the 4th floor, B happens to reach the 3rd floor. At this speed, when A runs to the 28th floor, how many floors does B run to?
甲、乙二人比赛爬楼梯，甲跑到第4层时，乙恰好跑到第3层．以这样的速度，甲跑到第28层时，乙跑到第多少层．
<gadget id="calculator">28 - 1</gadget>
<output>27</output>

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

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">27 * (2/3)</gadget>
<output>18</output>

<gadget id="calculator">18 + 1</gadget>
<output>19</output>

<result>19</result>