The length of a rectangle is 4 times its width. If the width is extended by 9 cm, it becomes a square. What is the perimeter of the original rectangle in cm?
一个长方形的长是宽的4倍，如果宽延长9厘米，这样就变成了一个正方形，原来长方形的周长是多少厘米？
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>