Question 1156704
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Let E = pounds of Empire;

    R = pounds of Red;

    G = pounds of Golden.


The equations are


    E + R + G = 21                   (total pounds)

    1.40E + 1.10R + 1.30G = 25.00    (total cost, in dollars)

    R = 2*(E + G).                   (the given constraint)
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Answered and completed.