In an isosceles triangle, the apex angle is four times the base angle. What is the maximum angle in degrees
在一个等腰三角形中，顶角是底角的4倍．最大角是多少°
<gadget id="calculator">1 + 1 + 4</gadget>
<output>6</output>

<gadget id="calculator">180 / 6</gadget>
<output>30</output>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<result>120</result>