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b - ilość chłopców
a+b = 33
a = 2b
2b + b = 33
3b = 33 | :3
b = 11
a = 22, b = 11
dziewczyny - 22
razem - 33
ja najpierw podzieliłam 33 na 3, wyszło 11 ---> 11 * 2 = 22
---> 22 + 11 = 33