Question
The distance between Sean's home and the grocery store is 600 m. After walking 250 m from his home to the grocery store, he stopped and walked back to a library. If the library is 100 m away from the grocery store, what was the distance he walked back?
4 m

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The distance between Sean's home and the grocery store is 600 m. After walking 250 m from his home to the grocery store, he stopped and walked back to a library. If the library is 100 m away from the grocery store, what was the distance he walked back?