A and B compete to climb stairs. When A runs to the 4th floor, B runs to the 6th floor. If the speed of the two people running the stairs remains the same, when A runs to the 10th floor, how many floors does B go to?
甲乙两人比赛爬楼梯，甲跑到4层时，乙恰好跑到6层，如果两人跑楼梯的速度保持不变，那么当甲跑到10层时，乙跑到了几层？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

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

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">9 * (5/3)</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>