A rectangle whose length is 4 times its width and whose length is 24 decimeters, what is the perimeter of this rectangle?
一个长方形，长是宽的4倍，长是24分米，这个长方形的周长是多少分米？
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">24 + 6</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<result>60</result>