A road construction team repaired a 168-kilometer-long highway. It repaired the full length (1/3) in the first ten days, repaired the full length (1/4) in the middle ten days, and repaired 50 kilometers in the last ten days. How many kilometers are left to be repaired?
某修路队修一条长168千米的公路，上旬修了全长的(1/3)，中旬修了全长的(1/4)，下旬修了50千米，还剩多少千米没有修？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">168 * (1/3)</gadget>
<output>56</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">168 * (1/4)</gadget>
<output>42</output>

<gadget id="calculator">168 - 56 - 42 - 50</gadget>
<output>20</output>

<result>20</result>