There is a building with the same number of steps on each floor. If there are 48 steps from the first floor to the fourth floor, then when Xiaohong steps up the 144th step from the first floor, what floor is she on?
有一栋楼，每层的台阶数相同．如果从第一层到第四层共有48级台阶，那么，当小红从第一层开始跨上第144级台阶时，她在第多少层．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">48 / 3</gadget>
<output>16</output>

<gadget id="calculator">144 / 16</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<result>10</result>