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bilet dzieciora - 9zł
doroslego 12zl
75 %z 12 to jest 9 :)
spr. 75% z 12 musi równać się 9
50% = 6
25%= 3
25% x 3 = 75% (9)
a - cena biletu os. dorosłej
b = ¾a - cena biletu dziecka
a+b = 21
a+ ¾a = 1¾a = 7/4a
7/4a = 21 / *4/7
a = 12
b = ¾ * 12 = 9
spr. 9+12 = 21