If f(x)=7-3x determine the value of x when f(x)=16

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?

Ming says that 0.24 > 1/4 because 0.24= 2/4. which best explains mings error

Having a hard time understanding this question (see attachment).