To build a 30-kilometer-long road, the rest (2/3) has been repaired, how many kilometers have been repaired?
修一条长30千米的路，已经修的占剩下的(2/3)，已经修了多少千米？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

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

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

<result>12</result>