If Abe leaves his group what happens to the average age in the group?
If Chris leaves the group instead what happens to the average?
If Erin leaves the group instead what happens to the average?
What would happen to the average ages in the two groups if Sam left his group and joined the other group?
Can you find a way for one child to leave one group and join the other so that the average age in the group he leaves drops and the average age in the group he joins rises?
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