a university student completed courses were three credits and some courses worth for credits the student earned a total of 54 credits after completing 15 courses how many courses worth 4 credits did the student complete
Let's assume the student completed x courses worth 4 credits each.
Since the student completed 15 courses in total, the number of courses worth 3 credits each would be 15 - x.
The total number of credits earned by the student can be calculated as:
3*(15-x) + 4x = 54
45 - 3x + 4x = 54
x = 9
Therefore, the student completed 9 courses worth 4 credits each.