Mathematics, 12.01.2021 23:30, nayelieangueira

Alfred has twelve coins in his piggy bank. Some of the coins are quarters, some are nickels, and he has a total of $3.15. Which system of equations can be used to determine how many quarters, x, and how many nickels, y, he has? Please don't answer unless you know the answer.

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Alfred has twelve coins in his piggy bank. Some of the coins are quarters, some are nickels, and he...