Write the correct ratio for the following situations. Express your answer in its simplest form:
a. Sheila is 30 minutes late for a variety show that is three hours long. What fraction of the variety show does she miss?
b. A basket has 120 bananas and mangoes. If there are 90 mangoes, what is the ratio of mangoes to bananas?
c. A class of 32 students has 12 girls. What is the ratio of girls to the entire class?
d. What is 15 out of 125 expressed as a fraction?
e. A class of 54 students has 16 boys. What is the ratio of boys to girls? What is the ratio of boys to the entire class?