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białe:4
procent:4/25 *100%=16%
dodawając (x- ilosc pilek dodanych)
wszystkie piłki: 25+x
białe:4+x
procent: (4+x)/(25+x) *100%= 30%
(4+x)/(25+x)=0.3
10(4+x)=3(25+x)
40+10x=75+3x
-35=-7x
x=5 tyle trzeba dodac