The length of a precision part measured on a scale of 100:1 is 25cm. What is the actual length in mm?
在比例尺是100：1的图上量得一精密零件的长是25cm，它是实际长度是多少mm．
<gadget id="calculator">100 / 1</gadget>
<output>100</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 10</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>