The base of a cuboid is a square with a perimeter of 20 cm. If the height is increased by 4 cm, it becomes a cube. What is the surface area of the original cuboid?
一个长方体的底面是一个周长为20厘米的正方形，如果把高增加4厘米，就变成一个正方体．原来长方体的表面积是多少平方厘米？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">5 * 1</gadget>
<output>5</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">25 + 5 + 5</gadget>
<output>35</output>

<gadget id="calculator">35 * 2</gadget>
<output>70</output>

<result>70</result>