complete application of rule of three in a simple and easy way (math)

the Rule of Tres Facil app is a great tool for learning, simple formula with this excellent application.

characteristics:

- Rule of 3 very easy to understand.
- You don't need internet.
- Language entirely in Portuguese.
- Explanation of how to do the account.
- Great design
- Simple three rule calculator


* Learn Rule of 3 simple in a very easy way.