The escalator in the shopping mall moves from top to bottom at a constant speed. Two naughty children walk on the moving escalator. The boy goes up 2 steps per second, and the girl goes up 3 steps in 2 seconds. As a result, the boy takes 100 seconds to reach the upper floor, and the girl It takes 200 seconds to reach the upper floor, and ask how many steps there are in the escalator on this floor.
商场自动扶梯匀速由上往下移动，两个顽皮的孩子在移动的扶梯上走动，男孩每秒钟向上走2级，女孩2秒钟向上走3级，结果男孩用100秒到达楼上，女孩用200秒到达楼上，问该楼层扶梯共有多少级．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">200 * (3/2)</gadget>
<output>300</output>

<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<gadget id="calculator">300 - 200</gadget>
<output>100</output>

<gadget id="calculator">200 - 100</gadget>
<output>100</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

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

<gadget id="calculator">1 * 100</gadget>
<output>100</output>

<result>100</result>