Eleven liters of white wine and eight liters of red wine cost a total of 1315 kc. 1 liter of white wine was 10 kc cheaper than a liter of red wine. How much is 1 liter of white and how much red wine?

Correct result:

b =  65
c =  75


11b + 8c = 1315
b = c - 10

11•b + 8•c = 1315
b = c - 10

11b+8c = 1315
b-c = -10

b = 65
c = 75

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