Hello autumnafternooWork withtotals. You know that

- average height of player =

Well, you can work that formula the other way round, so that it says:

- total height of players = average height of player x number of players

You know that three of the players have an average height of 6 feet 8 inches. So what is their total height?

Then work out what the total height of all five players will have to be, if their average is going to be 6 feet 4 inches.

Subtract your first answer from the second. Then divide by 2.

OK now?

Grandad