Gwen went walking three days one week. the first day she walked 3 1/2 miles. Each day after that, she walked 1/4 mile more than the day before. how many miles did Gwen walk this week.

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TSO
[tex]3 \frac{1}{2}+ 3 \frac{3}{4} +4=\boxed {11 \frac{1}{4} }[/tex]
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