Kiri has $8 and Jenny has $2. The average of the amounts they have can be found by adding up the total amount and then sharing it between them (dividing by two).
What is their average now?
What would their average be if Kiri gave Jenny $2?
Solution:
Their average now is $5. You can find this by adding $8 + $2 to get $10 and then dividing by 2.
If Kiri gave Jenny $2 they would still have the same total amount of money $10 so their average would still be $5.