A wire is 600 meters long, and all (4/5) is used up. How many meters are used?
一根电线长600米，用去了全部的(4/5)，用去了多少米．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">600 * (4/5)</gadget>
<output>480</output>

<result>480</result>