The base of a cuboid is a square, and the length of the sides of the base is twice the height. The sum of the lengths of the sides of this cuboid is 40 cm. What is the length of the sides of the base in cm?
一个长方体底面是正方形，底面边长是高的2倍，这个长方体棱长总和是40厘米，底面边长是多少厘米？
<gadget id="calculator">2 + 2 + 1</gadget>
<output>5</output>

<gadget id="calculator">40 / 4 / 5</gadget>
<output>2</output>

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

<result>4</result>