Question
The distance between Penelope's home and the mall is 570 m. After walking a distance from her home to the mall, she stopped and walked 20 m back to a school. If the school is 220 m away from the mall, how far had she walked before she stopped and walked back?
4 m

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The distance between Penelope's home and the mall is 570 m. After walking a distance from her home to the mall, she stopped and walked 20 m back to a school. If the school is 220 m away from the mall, how far had she walked before she stopped and walked back?