Of the 20 students in Emily's class 15 like chocolate cake and the rest like cheesecake how many like cheesecake and what percentage of the students like cheesecake
subtract 15 from 20 to get 5 (the number of "cheesecake" kids). Personally, I find ratios easy to convert to percentages, so 5:20 = 25:100, which is easily convertible to 25%. Your answers are 5 kids like cheesecake, which is 25% of all students.