If the side length of a square is 10 centimeters, if its perimeter is used to form a rectangle with a length of 12 centimeters, what is the width of the rectangle in centimeters?
一个正方形的边长是10厘米，如果用它的周长围成一个长12厘米的长方形，这个长方形的宽是多少厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<result>8</result>