It takes 56 workers 45 days to build a road. According to this calculation, how many workers need to be added if the project is to be completed 10 days ahead of schedule?
修筑一条公路，56个工人需要45天才能完工．照这样计算，若要提前10天完工，需增加多少个工人？
<gadget id="calculator">1 / 56 / 45</gadget>
<output>1/2_520 = around 0.000397</output>

<gadget id="calculator">45 - 10</gadget>
<output>35</output>

<gadget id="calculator">(1/2_520) * 35</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">1 / (1/72)</gadget>
<output>72</output>

<gadget id="calculator">72 - 56</gadget>
<output>16</output>

<result>16</result>