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Illustration of Rule of three

Rule of three

Calculate a proportion instantly.

🔒 100% local

If A corresponds to B, what does C correspond to?

Simple tools and a universe to explore.
100 mini apps and 30 games, right in your browser.

No account neededNo installationMobile friendly

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My Luxembourg Apps Datamac Games Shadows & Light · Books

Steve Cimolino

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© 2026 Steve Cimolino · Datamac · Shadows & Light universe / Molino“Knowledge brings light.”