A part is 3 cm long, draw it on a drawing with a scale of 10:1, how many centimeters should the length be drawn.
一个零件长3厘米，把它画在比例尺是10：1的图纸上，长应画多少厘米．
<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<result>30</result>