Let's denote the number of quarters as \( q \) and the number of dimes as \( d \).
We can set up the following equations based on the problem:
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The total number of coins is 59: \[ q + d = 59 \]
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The total value of the coins is $12.05, which is equivalent to 1205 cents. Since quarters are worth 25 cents and dimes are worth 10 cents, we can express this as: \[ 25q + 10d = 1205 \]
Now, we can solve these two equations.
From the first equation, we can express \( d \) in terms of \( q \): \[ d = 59 - q \]
Substituting \( d \) into the second equation: \[ 25q + 10(59 - q) = 1205 \]
Distributing the 10: \[ 25q + 590 - 10q = 1205 \]
Combining like terms: \[ 15q + 590 = 1205 \]
Subtracting 590 from both sides: \[ 15q = 615 \]
Dividing by 15: \[ q = 41 \]
Now we can find \( d \) using the first equation: \[ d = 59 - q = 59 - 41 = 18 \]
So Maggie has 41 quarters and 18 dimes.
Therefore, the answer is:
C: 41 quarters and 18 dimes.