Yolanda paid for her movie ticket using 28 coins, all nickels and quarters. The ticket cost $4. Which system of linear equations can be used to find the number of nickels, n, and the number of quarters, q, Yolanda used?

The total number of coins is 28, so n + q = 28. Each nickel is worth $0.05 and each quarter is worth $0.25, and together they cost $4, so 0.05n + 0.25q = 4. These equations match choice A.

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