The length of a part measured on a plan with a scale of 15:1 is 3 cm, what is the actual length of the part in cm?
在一幅比例尺是15：1的平面图上量得某零件的长度是3厘米，该零件的实际长度是多少厘米．
<gadget id="calculator">15 / 1</gadget>
<output>15</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>