Students A, B, and C scored an average of 86 in the first test of the 6th Primary School Hope Cup. The average score of A and B is 82, and the average score of B and C is 90. What is the average score of A and C?
甲乙丙三同学在第六届小学希望杯赛的第一试中，平均分为86．甲乙的平均分为82，乙丙的平均分为90，则甲丙的平均分是多少．
<gadget id="calculator">86 * 3</gadget>
<output>258</output>

<gadget id="calculator">82 * 2</gadget>
<output>164</output>

<gadget id="calculator">258 - 164</gadget>
<output>94</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">258 - 180</gadget>
<output>78</output>

<gadget id="calculator">94 + 78</gadget>
<output>172</output>

<gadget id="calculator">172 / 2</gadget>
<output>86</output>

<result>86</result>