The climbing escalator is running from bottom to top at a uniform speed, and two impatient children are going upstairs from the escalator. It is known that the boy walks 20 steps per minute, and the girl walks 16 steps per minute. As a result, the boy took 6 minutes to reach the upstairs, and the girl took 7 minutes to reach the upstairs. How many steps are there in the escalator?
登山自动扶梯以均匀速度由下往上行驶着，两位性急的孩子要从扶梯上楼．已知男孩子每分钟走20段，女孩子每分钟走16段，结果男孩子用了6分钟到达楼上，女孩子用了7分钟到达楼上．则该扶梯共有多少段．
<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<gadget id="calculator">16 * 7</gadget>
<output>112</output>

<gadget id="calculator">120 - 112</gadget>
<output>8</output>

<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">20 + 8</gadget>
<output>28</output>

<gadget id="calculator">28 * 6</gadget>
<output>168</output>

<result>168</result>