SOLUTION: There is this homework problem I have for Pre-Algebra. It is on scale factors. This is the problem: What scale factor was used to build a 55 ft wide billboard from a 25 in. wide

Question 717890: There is this homework problem I have for Pre-Algebra. It is on scale factors. This is the problem:
What scale factor was used to build a 55 ft wide billboard from a 25 in. wide model?
I tried to write a proportion (model to actual), and I ended up getting 5 in. to 11 ft. I remember my teacher saying that when doing a scale factor, and it is inches to feet, then it has to be a certain number of inches to 1 ft. He said the exception is that if the scale factor ends up like 1/6 in. to 1 ft because there is no 1/6 inch mark on a ruler. Now, I am confused as to how this problem should be done, and I would be very grateful if someone were to clearly explain how to do this problem.
By the way, I am sorry if the category for this question is incorrect.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
What scale factor was used to build a 55 ft wide billboard from a 25 in. wide model?
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Ans: (55*12)in/25in = (11/5)12 = 132/5 = 26 2/5 = 26.4
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The billboard is 26 2/5 or 132/5 times the model
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Scale factor: 26 2/5 or 26.4 to 1
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Cheers,
Stan H.
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