In a mathematics test, the average score of the top 8 in the class is 90 points. If the statistics reach the top 10, the average score will drop to 87 points, and the 10th place is 2 points less than the 9th place. The 10th place in this class will take this test How much should it be.
一次数学考试，班内前8名平均分是90分，若统计至前10名，平均分则降到87分，且第10名比第9名少2分，该班第10名这次考试应是多少分．
<gadget id="calculator">87 * 10</gadget>
<output>870</output>

<gadget id="calculator">90 * 8</gadget>
<output>720</output>

<gadget id="calculator">870 - 720</gadget>
<output>150</output>

<gadget id="calculator">150 / 2</gadget>
<output>75</output>

<gadget id="calculator">75 - 1</gadget>
<output>74</output>

<result>74</result>