Question
The distance between Mary's home and the bookstore is 530 m. After walking a distance from her home to the bookstore, she stopped and walked 50 m back to a park. If the park is 110 m away from her home, how far had she walked before she stopped and walked back?
2 m

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The distance between Mary's home and the bookstore is 530 m. After walking a distance from her home to the bookstore, she stopped and walked 50 m back to a park. If the park is 110 m away from her home, how far had she walked before she stopped and walked back?