The floor of the school auditorium is a rectangle with a length of 30 meters and a width of 20 meters. Now we are going to lay floor tiles with an area of 50 square decimeters. How many floor tiles are needed in total?
学校大礼堂地面是一个长30米，宽20米的长方形，现在准备铺面积是50平方分米的地砖，一共需要多少块地砖？
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">600 / 0.5</gadget>
<output>1_200</output>

<result>1_200</result>