In a school picnic, a total of 43 students brought a backpack, a lunchbox, or both a backpack and a lunchbox. If there are a total of 23 backpacks and 25 lunchboxes, how many students brought both a backpack and a lunchbox? (A) 5 (B) 7 (C) 10 (D) 17 (E) 20 (ebasznan) m donoubraglion 2.32 25 LB

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