In △ABC, ∠A=84°, ∠B is 12° greater than ∠C. Then ∠C=how much.
在△ABC中，∠A=84°，∠B比∠C大12°．则∠C=多少．
<gadget id="calculator">180 - 12 - 84</gadget>
<output>84</output>

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

<gadget id="calculator">84 / 2</gadget>
<output>42</output>

<result>42</result>