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y - ilosc biletow nor
x + y = 24
16y + 11x = 289
x = 24 - y
16y + 11(24-y) = 289
x = 24 - y
16y + 264 - 11y = 289
x = 24 - y
5y = 25 /:5
x = 24 - y
y = 5
x = 24 - 5 = 19
y = 5
19 biletow ulgowych i 5 normalnych
19 x 11 zł = 209 zł
5 x 16zł = 80zł
209zł + 80 zł = 289 zł