To achieve a grade of B in Math, Melvin must achieve an average score of at least 83 on five math tests. His scores on the first three tests are 85, 90, and 80. What is the lowest total score that Melvin must have on the last two tests to earn a B test average?

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours