tractor plows 3.85 hectares in the morning and 0.5 hectares less in the afternoon than in the morning. How many hectares does this tractor plow in total?
一台拖拉机上午耕地3.85公顷，下午比上午少耕0.5公顷．这台拖拉机全天一共耕地多少公顷？
<gadget id="calculator">3.85 - 0.5</gadget>
<output>3.35</output>

<gadget id="calculator">3.85 + 3.35</gadget>
<output>7.2</output>

<result>7.2</result>