Question
The distance between Wesley's home and the mall is 650 m. After walking 340 m from his home to the mall, he stopped and walked back to a library. If the library is 100 m away from the mall, what was the distance he walked back?
4 m

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The distance between Wesley's home and the mall is 650 m. After walking 340 m from his home to the mall, he stopped and walked back to a library. If the library is 100 m away from the mall, what was the distance he walked back?