Question: Find the answer to this math problem: Movie A was one-fourth the length of Movie B. Movie B was 5 minutes longer than Movie C. Movie C was 1.25 hours. How many minutes long was Movie A?
Answer: 
Movie C = 1.25 hours = 75 minutes
Movie B = 75 + 5 = 80 minutes
Movie A = (1/4) * 80 = 20 minutes
Movie A was 20 minutes long.