The scale of a drawing of a precision part is 5:1. The length of a part measured on the drawing is 45 mm. What is the actual length of the part?
一张精密零件图纸的比例尺是5：1，在图纸上量得一个零件的长度是45毫米，这个零件的实际长度是多少．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>