Five students A, E, I, O, and U, were comparing the scores each received on a test and a quiz. the following was discovered: A's quiz score was 80 A's test score equals U's quiz score U's test score equals A's quiz score A's quiz score is 15 less than U's quiz score O's test score is 20 more than his quiz score and is 20 more than I's test score O's test score is 40 more than E's quiz score I's quiz score is 10 less than E's quiz score Question 4 If I's test score is 45, what is O's test score?