Mathematics · Data Interpretation

In four schools ('A', 'B', 'C', and 'D'), an optional class was conducted. The table below shows the percentage of students who attended the class out of total students and the difference between those who attended and those who did not attend: School A: 60% attended, difference = 120 School B: 30% attended, difference = 160 School C: 20% attended, difference = 180 School D: 75% attended, difference = 140 Find the ratio of the number of students who did not attend class in 'A' and 'C', respectively.