Use lead wire to make 4 rectangles, each with a width of 5 decimeters and a length that is 4 times the width, how many decimeters of lead wire should be used?
用铅丝做4个长方形，每个宽是5分米，长是宽的4倍，要用多少分米长的铅丝？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 * 2 * 4</gadget>
<output>200</output>

<result>200</result>