The scale of a precision part drawing is 5:1. The length of a certain part measured on the drawing is 30mm. What is the actual length of this part?
一张精密零件图纸的比例尺是5：1，在图上量得某个零件长度是30毫米，这个零件实际长度是多少．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>