Dad replaced the living room of grandma's house with non-slip floor tiles, and covered it with 140 square floor tiles with a side length of 0.5 meters. How many square meters is the floor area of the living room?
爸爸给奶奶家的客厅换上了防滑地板砖，用边长0.5米的正方形地板砖140块正好铺满，客厅地面的面积多少平方米？
<gadget id="calculator">0.5 * 0.5 * 140</gadget>
<output>35</output>

<result>35</result>