Megan has fifty quarters and dimes. Their total value is $9.80. Which of these systems of equations can be used to find the number of quarters (q) and dimes (d) Megan has? q + d = 50

0.25q + 0.10d = 9.80

q + d = 50

25q + 10d = 980
q = d + 50

25q + 10d = 980

q = d + 50

q + d = 9.80

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