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The diameter of the Earth is about 13,000km. The diameter of the moon is about 3,500km. If the student makes her model of the Earth 26mm in diameter, what should be the diameter of her model of the moon
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The diameter of the Earth is about 13,000km. The diameter of the moon is about 3,500km. If the student makes her model of the Earth 26mm in diameter, what should be the diameter of her model of the moon in mm?

User Tschitsch
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Think of it like a ratio. 13000 km / 26 mm is equal to 3500 km / x mm. Solve for x using cross multiplication. x = 7mm.
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User DougKruger
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