In a shopping mall, there is an escalator that is moving upwards. Xiao Ming descends 120 steps from the top to the bottom, and then climbs 90 steps from the bottom to the top. The number of steps from the bottom to the top of the escalator remains the same. The number of steps going down in a minute is twice the number of steps he goes up, what is the number of steps from the bottom to the top of the escalator?
在商场里，有一台正在向上移动的自动扶梯，小明从顶部下120级台阶到达底部，然后从底部上90级台阶回到顶部，自动扶梯从底部到顶部的台阶数是不变，假设小明每分钟下台阶数是他上台阶数的2倍，则该自动扶梯从底部到顶部的台阶数为多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 90</gadget>
<output>60</output>

<gadget id="calculator">120 + 60</gadget>
<output>180</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">180 / (5/3)</gadget>
<output>108</output>

<result>108</result>