Everywhere, you say I want one apple, or twocookies; both rational numbers.
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In the real world you can use the order of rational numbers. This is used a lot in math.
Rational function can be used in real life in modeling multi-person work problems.
use in counting
Every time you think or say a positive, whole, or fractioned, number, you use positive rational numbers. You might say that you are 19 years old; or that yor birthday is on January 5th etc.
I would hope all elections use rational numbers: all Counting numbers are Rational numbers.