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Here are five cards. 1 5 7 9 11 One of the cards is removed. The mean of the numbers on the remaining four cards is 6 Which card was removed

 Mar 12, 2021
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Here are five cards. 1 5 7 9 11 One of the cards is removed. The mean of the numbers on the remaining four cards is 6 Which card was removed    

 

If four cards average 6, then they must total 24. 

 

18 & 6 will do it, so the removed card was the 9.     (18=7+11 and 6=5+1)  

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 Mar 12, 2021

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