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

5 students like cheesecake because if there is 20 students in all and 15 like chocolate and the rest like cheesecake you do 20-15=5

If 5 students like cheesecake out of 20 it would be 5/20 20*5=100 just multiply by 5 5*5=25%

25% of 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.