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old = 3.0mm x 1,000 = 3,000mm

new = 2.8mm x 1,000 = 2,800mm

3,000 - 2,800 = 200

so old coin pile is 200mm taller

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6y ago
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Q: How much taller is 1000 old 1 pound coins than 1000 new one pound coins?
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