The average score of Xiaoqiang's three homework is 85 points. If the math score is not counted, the average score of the two homework is 1 point lower than the average score of the three homework. How much is Xiaoqiang's math score?
小强的三门功课，平均成绩是85分，如果不算数学成绩，两门功课的平均成绩比三门功课的平均成绩要降低1分，求小强的数学成绩是多少分？
<gadget id="calculator">85 * 3</gadget>
<output>255</output>

<gadget id="calculator">85 - 1</gadget>
<output>84</output>

<gadget id="calculator">84 * 2</gadget>
<output>168</output>

<gadget id="calculator">255 - 168</gadget>
<output>87</output>

<result>87</result>