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B. 1 cm=3ft
To find the scale of the blueprint, we need to compare the length on the blueprint to the actual length. Since the length on the blueprint is 5 cm and the actual length is 15 feet, we can set up a ratio:
5 cm / 15 ft = x cm / 1 ft
Cross multiply to solve for x:
5 ft * x = 15 cm
5x = 15
x = 3
Therefore, the scale of the blueprint is 1 cm = 3 ft.