A stool has four legs with a total length of 2 meters, and three of the legs have a total length of 150 cm. What is the approximate height of this stool?
一张凳子四个脚一共长2米，其中三个脚一共长150厘米，这张凳子大约有多少厘米高．
<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<result>50</result>