Sameera planned a rectangular walkway to be 25 ft long. She decides to change the walkway to be 45 ft long. What is the change in the scale factor?

Compare the new length to the original length: 45 ÷ 25 = 9/5. The scale factor is therefore 9 to 5, but the question asks for the change in scale factor from the original plan to the new one, expressed as original to new: 25 to 45, which simplifies to 5 to 9. So the answer is 5 to 9.

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