In a certain mathematics test, the average score of A, B, and C is 80 points. The scores of A and B are respectively: 81 points and 67 points. What is the score of C?
某次数学测验，甲、乙、丙的平均成绩为80分，甲、乙的成绩分别为：81分，67分，丙的成绩为多少分．
<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<gadget id="calculator">240 - 81 - 67</gadget>
<output>92</output>

<result>92</result>