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20 - masa wody
x+20 - masa syropu 20%
30%*x+0%*20=20%*(x+20)
0,30x+0=0,20x+0,20*20
0,3x=0,2x+4
0,3x-0,2x=4
0,1x=4
x=40
40+20 =60
Masa syropu 20% wynosi 60kg