Mathematics, 16.09.2019 13:10, 194210lhs

George has 9 more dollars than frank, who has 3 more than richard. what is the least amount of money that must be exchanged so that they each have the same amount of money?
i know the answer is $7 but is there a quicker way to do it instead of guess and check?

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George has 9 more dollars than frank, who has 3 more than richard. what is the least amount of money...