This equation shows how the total number of quizzes Angie has ever taken in high school depends on the number of weeks she has attended school this quarter.

q = w + 3

The variable w represents the number of weeks she has attended school this quarter, and the variable q represents the total number of quizzes she has ever taken in high school. How many weeks of school will Angie have to attend this quarter before she will have taken a total of 12 quizzes?