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Mathematics, 09.02.2021 18:00 MeIsBella

'Here are 5 number cards, '2' '5' '7' '8' '9'. One of the cards is removed and the mean average of the remaining 4 cards is 6. Which card was removed (Please show your working).


'Here are 5 number cards, '2' '5' '7' '8' '9'. One of the cards is removed and the mean average of

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