a universty student completed course worth 3 credits and some course worth 4 credits. the student earn a total of 54 credits after completing 15 course. how many course worth 4 credits did the student comeplete?
9
6
20
32
Let's use algebra to solve this problem. Let x be the number of courses worth 4 credits that the student completed.
The total number of courses worth 3 credits would be 15 - x.
The total number of credits earned can be calculated as:
3 * (15 - x) + 4x = 54
45 - 3x + 4x = 54
45 + x = 54
x = 54 - 45
x = 9
Therefore, the student completed 9 courses worth 4 credits.