There are 5 numbers, and their average is 72.6. If you arrange them in descending order, the average of the first 3 numbers is 74.9, and the average of the last 3 numbers is 70.2. Find the middle number.
有5个数，它们的平均数是72.6，如果把它们按从大到小的顺序排列起来，前3个数的平均数是74.9，后3个数的平均数是70.2，求中间数．
<gadget id="calculator">74.9 * 3</gadget>
<output>224.7</output>

<gadget id="calculator">70.2 * 3</gadget>
<output>210.6</output>

<gadget id="calculator">224.7 + 210.6</gadget>
<output>435.3</output>

<gadget id="calculator">72.6 * 5</gadget>
<output>363</output>

<gadget id="calculator">435.3 - 363</gadget>
<output>72.3</output>

<result>72.3</result>