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Answer:
273 story books are in the third box
Step-by-step explanation:
givens:
total= 800
1st box= 278
2nd box= 278-29
3rd box= 800- (1st box+ 2nd box)
3rd box= 800-[(278)+(278-29)]
3rd box= 800- (278+249)
3rd box= 800- 527
3rd box= 273 books