rectangular lawn is 200 meters long and 160 meters wide, leaving 3,500 square meters in the middle as a fountain, and the rest is planted with turf. How many square meters is the area for planting turf?
一块长方形草坪长200米，宽160米，中间留下3500平方米的地方做喷水池，其余的种草皮，种草皮的面积是多少平方米？
<gadget id="calculator">200 * 160</gadget>
<output>32_000</output>

<gadget id="calculator">32_000 - 3_500</gadget>
<output>28_500</output>

<result>28_500</result>