The length of a precision part is 5 mm. If it is drawn on the part drawing with a scale of 4:1, how many centimeters should the length be drawn?
精密零件的长是5毫米，把它画在比例尺是4：1的零件图上，长应画多少厘米．
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 * (2/5)</gadget>
<output>2</output>

<result>2</result>