Question

Here are 5 number cards 2 5 7 8 9 one of the cards is removes and the mean average of the remaining four number cards is 6. Which card was removed? You must show your working

Answer 1

Answer:

7

Step-by-step explanation:

If one of the cards is removes and the mean average of the remaining four number cards is 6, then their sum is $6\cdot 4=24.$

The sum of all five cards is

$2+5+7+8+9=31.$

Since $31-24=7,$ then the card with number 7 is removed.