A construction team has repaired a 39-kilometer-long road for 16 days, with an average of 1.2 kilometers of road repaired every day. If the rest of the road is repaired for 1.1 kilometers every day, how much will it take? (solution by equation)
某建筑队修一条39千米长的公路，已修整了16天，平均每天修1.2千米长的公路．剩下的路如果每天修1.1千米，还需用多少夭？(用方程解)
<gadget id="calculator">16 * 1.2</gadget>
<output>19.2</output>

<gadget id="calculator">39 - 19.2</gadget>
<output>19.8</output>

<gadget id="calculator">19.8 / 1.1</gadget>
<output>18</output>

<result>18</result>