Workers build a road. If they build 12 meters a day and finish it in 10 days, now they build 3 meters more every day than before. How many days will it take to finish it now?
工人修一条路，如果每天修12米，10天修完，现在每天比原来多修3米，现在几天修完？
<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">10 / 15</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 * (2/3)</gadget>
<output>8</output>

<result>8</result>