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60,5zl-12,5zl = 48
48- 12kartkonow soku
x - 1karton
x=4zl
(12x 2,5) + (5x4) = 50zl
60,5 - 12,50= 48zł
48/12 = 4zł - soczek
.
5x4 = 20
12x2,50 = 30
30+20 = 50 zł