When a rope encloses a square, the side length is 7.5 decimeters. If the circumference is changed to a rectangle of 8.2 decimeters, how many decimeters should the width be?
一根绳子围成一个正方形时，边长是7.5分米，如果改围成长是8.2分米的长方形，宽应是多少分米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">7.5 * 2</gadget>
<output>15</output>

<gadget id="calculator">15 - 8.2</gadget>
<output>6.8</output>

<result>6.8</result>