The perimeter of an isosceles triangle is 40 cm and the base is 4 cm longer than the waist. What is the base in cm?
一个等腰三角形周长是40厘米，底比腰长4厘米，它的底是多少厘米？
<gadget id="calculator">40 - 4</gadget>
<output>36</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<gadget id="calculator">12 + 4</gadget>
<output>16</output>

<result>16</result>