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Janine Xavier constructed a model airplane in perfect proportion to the original. The length of the model's wing was 13 inches while the length of the actual wing is 39 feet. If the diameter of the propeller is 9 feet, what is the diameter of the propeller on Janine's scale model?

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1. Janine Xavier constructed a model airplane in perfect proportion to the original. The length of the model's wing was 13 inches while the length of the actual wing is 39 feet. If the diameter of the propeller is 9 feet, what is the diameter of the propeller on Janine's scale model?





 
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