In a triangle, ∠A is 3 times ∠C, ∠B is 2 times ∠C, what is the degree of ∠C?
一个三角形中，∠A是∠C的3倍，∠B是∠C的2倍，那么∠C是多少度．
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

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

<result>30</result>