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48 * 4 = 192 <- liczba dziewcząt
48 * 5 = 240 <- liczba chłopców
432/9=48
4*48=192
5*48=240
5x- liczba chlopcow
4x + 5x = 432
9x = 432 /:9
x = 48
4*48 = 192 <<< liczba dziewczyn
5 * 48 = 240 << l. chlopcow