A classroom is 7 meters long and 5 meters wide, and exactly 70 floor tiles are used to cover the floor. What is the average area of each floor tile in square meters?
一间教室长7米，宽5米，铺满地面正好用了70块地砖，平均每块地砖的面积是多少平方米？
<gadget id="calculator">5 / 70</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">7 * (1/14)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>