Xiao Ming scored an average of 95 points in Chinese and mathematics in an exam, and an average score of 90 points in Chinese, mathematics, and general knowledge. How much did Xiao Ming score in the general knowledge test?
小明在一次考试中，语文、数学的平均分是95分，语文、数学、常识三科的平均分是90分，小明常识考了多少分．
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">95 * 2</gadget>
<output>190</output>

<gadget id="calculator">270 - 190</gadget>
<output>80</output>

<result>80</result>