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Answer to Question #4442 in Calculus for ze

Question #4442
Sam paid $64 for 5 similar files and 3 similar textbooks.A textbook cost $8 more than a file.What was the cost of one textbook?
Expert's answer
let file cost x$ then textbook cost (x+8)$ so we can write equation
5*x+3*(x+8)=64 5x+3x+24=64 8x=40 x=5$.
so one file cost 5$.
and one
textbook cost 5+8=13$

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