(x cookies) / (23 students - (12/2) students) = 2 cookies per student [x / (23 - 6)] cookies per student = 2 cookies per student 23 students * (2 cookies per students) - 12 cookies = x cookies The "students" unit cancels 46 cookies - 12 cookies = x cookies x cookies = 34 cookies
The answer is 3. If you set it up in a T table and label x as the number of hours and y as the number of rows. Then use rise over run (y over x) the fractions simplify to 3 over 1.