If 4 squares with a side length of 5 decimeters are put together to form a large square, what is the perimeter of the assembled square?
把4个边长是5分米的正方形拼成一个大正方形，拼成的正方形的周长是多少分米．
<gadget id="calculator">2 * 5 * 4</gadget>
<output>40</output>

<result>40</result>