Here are five number cards. 2. 5 7 8 9 71 One of the cards is removed and the mean average of the remaining four number cards is 6 Which card was removed? You must show your working. Note: Please make sure your final answer says card ...

Here are five number cards 2 5 7 8 9 71 One of the cards is removed and the mean average of the remaining four number cards is 6 Which card was removed You must class=