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That is extremely simple. Think about it next time if 1ft = 3cm then 18ft = 3cm x 18 which then equals 54cm so the main mast on the model sail boat will be 54cm

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Q: Fred is building a model of a sailboat to scale He is using a scale of 3 cm equals 1 ft If the main mast of the sail boat is 18 ft tall how tall will the main mast be in the model?
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