The "Water Cube" covers an area of about 5 hectares, and how many "Water Cubes" cover an area of about 1 square kilometer.
"水立方"占地面积约5公顷，多少个"水立方"的占地面积约为1平方千米．
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">1 * 20</gadget>
<output>20</output>

<result>20</result>