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Proportions are used in real life to determine prices of things.
Ir is in some people's real life. Example: millions of students that want to pass algebra.
Umm... first of all this question isn't grammatically correct, but I'll answer the question, "How useful are whole numbers in real life?". They are useful to know when you when you are taking an algebra class:)
When taking a math examination is the most important real life example.
They could help you solve a Rubik's Cube.