A square with a side length of 7 cm is surrounded by a rope with a length of 48 cm. How many centimeters are left?
用一根长48厘米的绳子将一个边长是7厘米的正方形围一圈，还剩下多少厘米？
<gadget id="calculator">7 * 4</gadget>
<output>28</output>

<gadget id="calculator">48 - 28</gadget>
<output>20</output>

<result>20</result>