A rectangular office is 9 meters long and 5 meters wide. There are 675 wooden floor tiles on the floor of this office. How many wooden floor tiles are laid on average per square meter?
一间长方形办公室长9米，宽5米．铺这间办公室地面共用675块木地砖，平均每平方米铺了多少块木地砖？
<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<gadget id="calculator">675 / 45</gadget>
<output>15</output>

<result>15</result>