If a road with a length of 60 kilometers is built, what has been repaired is the rest (1/4). How many kilometers have been repaired?
修一条长60千米的路，已修的是剩下的(1/4)，已修多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">60 / (5/4)</gadget>
<output>48</output>

<gadget id="calculator">60 - 48</gadget>
<output>12</output>

<result>12</result>