The average of $9$ numbers is $140$. One of the numbers is $180$.  What is the average of the other $8$ numbers?     Below is Fred\textquotesingle s working.  $140 + 180 = 320$  $320\div8= 40$  The average of the other $8$ numbers is $40$.     Is Fred\textquotesingle s answer correct? If not, what is the correct answer? 
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