To build a 1500-meter-long road, (3/5) has been built, how many meters are left to be repaired.
修一条1500米长的公路，已经修了(3/5)，还剩多少米没有修．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_500 * (3/5)</gadget>
<output>900</output>

<gadget id="calculator">1_500 - 900</gadget>
<output>600</output>

<result>600</result>