The perimeter of square A is 12 cm, and the side length of square B is 3 cm longer than the side length of square A. Find the perimeter of square B.
甲正方形的周长是12厘米，乙正方形的边长比甲正方形的边长多3厘米，求乙正方形的周长．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>