The average of three numbers is 8.5, the first number is 9.3, the second number is 0.2 greater than the third number, find the third number. Use equations and formulas in two ways.
三个数的平均数是8.5，其中第一个数是9.3，第二个数比第三个数大0.2，求第三个数．用方程和算式两种方法．
<gadget id="calculator">8.5 * 3</gadget>
<output>25.5</output>

<gadget id="calculator">25.5 - 9.5</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>