A part is drawn on the diagram at a ratio of 5:1, and the length on the diagram is measured to be 30 centimeters, what is the actual length in centimeters?
一个零件按5：1的比例画在图上，量得图上的长度是30厘米，那么实际长度是多少厘米．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

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

<result>6</result>