In a dormitory building, there are 20 steps between every two floors, and the height of each step is 15 cm. A classmate walked from the first floor to the third floor, how many meters did he rise?
一幢宿舍楼，每两层楼之间有20个台阶，每个台阶的高度是15厘米．一个同学从一楼走到三楼，他升高了多少米？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">20 * 2 * (3/20)</gadget>
<output>6</output>

<result>6</result>