Ronnie took a total of 12 quizzes over the course of 2 weeks. How many weeks of school will Ronnie have to attend this quarter before he will have taken a total of 18 quizzes? Solve using unit rates.

Ok so start with the proportion 12/2 (the number of quizzes per 2 weeks) and set it equal to 18/X (X being the number of weeks that will equal 18 quizzes) after that cross multiply to get 12X=36. divide by 12 to get X=3 weeks