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  • https://math.libretexts.org/Courses/Long_Beach_City_College/Intermediate_Algebra/05%3A_Systems_of_Linear_Equations/5.5%3A_Solve_Mixture_Applications_with_Systems_of_Equations
    We had to decide if we were going to let n be the number of nickels and then write the number of dimes in terms of n, or if we would let d be the number of dimes and write the number of nickels in ter...We had to decide if we were going to let n be the number of nickels and then write the number of dimes in terms of n, or if we would let d be the number of dimes and write the number of nickels in terms of d. The interest rate on the bank loan is 2.5% and the interest rate on the federal loan is 6.9 %. The total amount of interest she paid last year was $1,066.

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