A rectangular vegetable field with a width of 5 meters has the same area as a square with a side length of 10 meters. What is the length of this rectangular vegetable field?
一块宽为5米的长方形菜地，它的面积与边长10米的正方形面积相等．这块长方形菜地的长是多少米．
<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>