Here are five number cards.
2
5
7
8.
CO
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 ...
EC
brate Geb
![Here are five number cards 2 5 7 8 CO One of the cards is removed and the mean average of the remaining four number cards is 6 Which card was removed You must s class=](https://us-static.z-dn.net/files/d27/fbc2401577120747da0b67c90981a3d6.png)