To lay floor tiles for a room with a length of 5 meters and a width of 3 meters, if 25 tiles are needed per square meter, how many tiles are needed to cover the room?
给一个长5米，宽3米的房间铺地砖，如果每平方米需地砖25块，铺满这个房间需要多少块地砖？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 25</gadget>
<output>375</output>

<result>375</result>