Use 5 squares with a side length of 4 cm to form a rectangle. What is the perimeter of this rectangle?
用5个边长4厘米的正方形拼成一个长方形．这个长方形的周长是多少？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<result>48</result>