A rectangle has the same area as a square whose side length is 6 decimeters. It is known that the width of this rectangle is 3 decimeters. What is its length?
一个长方形与一个边长为6分米的正方形面积相等，已知这个长方形的宽是3分米，它的长是多少分米．
<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>