A rope is 125 meters long, and 40% of its total length is used up, how many meters are left?
一条绳子长125米，用去了全长的40%，还剩多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">125 * (3/5)</gadget>
<output>75</output>

<result>75</result>