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dzieci 30%
12 ------ 30%
x ------ 100%
12 ------ 0,3
x ------ 1
0,3 x = 12
x= 40
odp. Autobusem jechalo 40 osob
dzieci - 12 - 30%
12 - 30%
4 - 10%
40 - 100%
Odp. Jechało 40 osób.