Alice and Bob each took five tests, each scored out of a maximum of 100 points. Alice averaged 85 on the five tests. Bob scored 3 points higher than Alice on the first test, 7 points lower on the second test, 10 points higher on the third test, 4 points lower on the fourth test, and 8 points higher on the fifth test. What is the difference between Bob's average and Alice's average on these five tests?
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