價格：免費
更新日期：2017-01-03
檔案大小：12.3 MB
目前版本：2.0
版本需求：需要 iOS 7.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
This is a Handy Rule of Three that will help you out to solve those little math problems you may encounter in your daily life.
Handy Rule of Three supports the direct and inverse rule of three.
Direct mode C*B/A
If an exam has 30 questions which makes 100%
What percentage makes 24 correct answers?
x= 20*100/30
x= 80
Inverse mode A*B/C:
If making dinner takes 3 hours to 2 people.
How long would it take to 1 person?
x= 3*2/1
x= 6
支援平台：iPhone, iPad