Why do we have to learn algebra and how do people use it in our daily life?

Question

Why do we have to learn algebra and how do people use it in our daily life?

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Answer 1

Every time someone alters that recipe for four people to feed two, they are using algebra. Every time someone figures out how much a half-tank of gas is going to cost them, or how much gas they can buy for $10.00, they are using algebra. Every time someone calculates how much the tip should be, they are using algebra.

BTW, the principles of algebra are identical to the principles of logic. Both can be derived from category theory.