Question 1175487
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Writing such system is easy, standard and routine task


       x  +     y = 280  liters     (1)     (total volume)

    0.25x + 0.20y =  61  liters     (2)     (amount of "real fruit juice")



In this system, x is the volume of the 25% juice (drink A), and

                y is the volume of the 20% juice (drink B).
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Your request is satisfied: the requested system of equations is written.