In a six-story residential building, there are 20 steps between every two floors, and each step is 15 cm high. How many meters does it rise from the ground floor to the top floor?
一幢六层住宅楼，每两层楼之间有20个台阶，每个台阶高15厘米，若从底楼上到顶楼共上升了多少米．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">20 * 5 * (3/20)</gadget>
<output>15</output>

<result>15</result>