In a certain mathematics test, 8 people scored 90 points, accounting for 12.5% of the number of people who took the test. The sum of the scores of these 8 people accounts for 15% of the total score. What is the average score of this test?
某次数学考试，得90分的有8人，占参加考试人数的12.5%．这8人的得分之和，占全体总分的15%，这次考试的平均成绩是多少分？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">12.5 / 100</gadget>
<output>0.125</output>

<gadget id="calculator">8 / 0.125</gadget>
<output>64</output>

<gadget id="calculator">8 / (3/20) / 64</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">90 * (5/6)</gadget>
<output>75</output>

<result>75</result>