If a straight angle is divided into two angles, one of which is twice the size of the other, what is the larger angle?
把一个平角分成两个角，其中一个角是另一个角的2倍，则较大角是多少．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">180 / 3</gadget>
<output>60</output>

<gadget id="calculator">180 - 60</gadget>
<output>120</output>

<result>120</result>