Xiao Ming's average score in Chinese, Mathematics, and Nature in the final exam last semester was 95, of which 90 was Chinese and 98 was Mathematics. What is his natural score?
小明上学期期末考试语文、数学、自然三门平均成绩是95分，其中语文90分，数学98分，他的自然成绩是多少分．
<gadget id="calculator">95 * 3</gadget>
<output>285</output>

<gadget id="calculator">285 - 90 - 98</gadget>
<output>97</output>

<result>97</result>