The grain warehouse shipped 18.5 tons of rice, 2.86 tons more than the wheat, and 4.09 tons less corn than the total of rice and wheat. How many tons of corn were shipped?
粮食仓库运来大米18.5吨，比运来的小麦多2.86吨，运来的玉米比大米和小麦的总数少4.09吨，运来玉米多少吨？
<gadget id="calculator">18.5 - 2.86</gadget>
<output>15.64</output>

<gadget id="calculator">18.5 + 15.64</gadget>
<output>34.14</output>

<gadget id="calculator">34.14 - 4.09</gadget>
<output>30.05</output>

<result>30.05</result>