Rule of Three is an Android app developed by Marcio Rosa that simplifies everyday calculations by solving issues such as changing quantities of ingredients in recipes, calculating fuel consumption, finding proportional quantities, and more. The app is designed to make your life easier by providing quick solutions to common problems that require Rule of Three's calculations, also known as cross multiplication.

With its simple and user-friendly interface, Rule of Three is easy to use and navigate. The app is free to download and use, making it accessible to anyone who needs it. Whether you're a student, a chef, or someone who needs to make quick calculations on the go, Rule of Three has got you covered.

Overall, Rule of Three is a great app that delivers on its promise of simplifying everyday calculations. If you're looking for a useful and straightforward app that can help you with Rule of Three's calculations, then Rule of Three is definitely worth checking out.