There are two cement warehouses. There are 42.5 tons of cement in the first warehouse, and 28.2 tons of cement in the second warehouse. Later, 8.6 tons of cement were transported from the first warehouse to the second warehouse. At this time, how many tons less cement in the first warehouse than in the second warehouse?
有两个水泥仓库．第一仓库里有水泥42.5吨，第二仓库里有水泥28.2吨，后来从第一仓库里运8.6吨水泥到第二仓库．这时，第一仓库的水泥比第二仓库少多少吨？
<gadget id="calculator">28.2 + 8.6</gadget>
<output>36.8</output>

<gadget id="calculator">42.5 - 8.6</gadget>
<output>33.9</output>

<gadget id="calculator">36.8 - 33.9</gadget>
<output>2.9</output>

<result>2.9</result>