Reading the sentence below what keyword tells you that this is proportional. Please help I’m stuck!!

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class