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how many dimes and quarters does jill have if she has $9.90 in dimes and quarters and she has 3 times as many dimes as quarters?

  • math -

    D = 3Q

    10D + 25Q = 990

    Substitute 3Q for D in second equation and solve for Q. Insert that value into the first equation and solve for D. Check by inserting both values into the second equation.

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