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x - ilosc biletow ulgowych
y - ilosc biletow normalnych
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
Odp. Kupiono 19 biletow ulgowych i 5 normalnych
2. 1310 : 107 = 12,24
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