The engineering team plans to build a section of 50km long highway, 35km has been built, and how much is left to be repaired.
工程队计划修一段长50km的公路，已经修了35km，还剩多少没修．
<gadget id="calculator">50 - 35</gadget>
<output>15</output>

<gadget id="calculator">15 / 50</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>