Use the app Rule of three to calculate rule of three simple direct, simple inverse, Compound simple, Compound inverse and composite. Cross multiplication calculator to solve problems of rule of three.
Get the free setup package of Rule of three 1.0 and take a look at users' reviews on Droid Informer. The app can be launched on Android devices 4.0.3 and above. It's secure to download this application. CoolAppClub is the creator of Rule of three which refers to the Tools category.
The latest release was on Feb 22, 2017 and the app was downloaded and set up by over 1K users. Google Play shows that this application is rated 3.6 by its users. Ads are a part of Rule of three.