A road construction team built a road with a length of 144 meters. It repaired 1/3 of the full length in the first ten days, 1/4 of the full length in the middle ten days, and 40.5 kilometers in the last ten days. How many kilometers are left to be repaired?
某修路队修一条长144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40.5千米，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">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) + (1/4)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">144 * (7/12)</gadget>
<output>84</output>

<gadget id="calculator">144 - 84 - 40.5</gadget>
<output>19.5</output>

<result>19.5</result>