The width of a rectangle is 4 cm, and the length is 2 cm more than three times the width, what is its perimeter?
一个长方形的宽是4cm，长比宽的3倍还多2cm，它的周长为多少．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 + 2</gadget>
<output>14</output>

<gadget id="calculator">14 + 4</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<result>36</result>