Manufacture an automobile part, the scale is 8:1, the length of the part on the design drawing is 4 cm, what is the actual length of the part?
制造一种汽车零件，比例尺是8：1，在设计图上零件的长度是4厘米，则零件的实际长度是多少．
<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>