Two naughty children are walking in the opposite direction of the escalator. In 20 seconds, the boy can walk 27 steps, and the girl can walk 24 steps. As a result, the boy walked for 2 minutes to reach the other end, and the girl walked for 3 minutes to reach the other end. Q: How many steps does the escalator have?
两位顽皮的孩子逆着自动扶梯的方向行走．在20秒钟里，男孩可走27级梯级，女孩可走24级梯级，结果男孩走了2分钟到达另一端，女孩走了3分钟到达另一端．问：该扶梯共多少级？
<gadget id="calculator">120 / 20</gadget>
<output>6</output>

<gadget id="calculator">6 * 27</gadget>
<output>162</output>

<gadget id="calculator">180 / 20</gadget>
<output>9</output>

<gadget id="calculator">9 * 24</gadget>
<output>216</output>

<gadget id="calculator">216 - 162</gadget>
<output>54</output>

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

<gadget id="calculator">54 / 1</gadget>
<output>54</output>

<gadget id="calculator">54 * 2</gadget>
<output>108</output>

<gadget id="calculator">162 - 108</gadget>
<output>54</output>

<result>54</result>