The canteen burned 0.5 tons of coal in the first week, and saved 0.14 tons in the second week compared with the first week. How many tons of coal were burned in two weeks?
食堂第一周烧煤0.5吨，第二周比第一周节约0.14吨，两周共烧煤多少吨？
<gadget id="calculator">0.5 - 0.14</gadget>
<output>0.36</output>

<gadget id="calculator">0.36 + 0.5</gadget>
<output>0.86</output>

<result>0.86</result>