A highway is 1500 meters long, and 900 meters have been repaired, what fraction of the total length needs to be repaired?
一条公路长1500米，己修好900米，还需修全长的几分之几？
<gadget id="calculator">1_500 - 900</gadget>
<output>600</output>

<gadget id="calculator">600 / 1_500</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>