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kwas 20% - 3-x
85%*x+20%*(3-x) = 30%*3
0,85x+0,2(3-x) = 0,3*3
0,85x+0,6-0,2x = 0,9
0,65x+0,6 = 0,9
0,65x = 0,9-0,6
0,65x = 0,3 |:0,65
x = 6/13
kwas 85% - 6/13
kwas 20% - 3-6/13 = 2i7/13
6/13:2i7/13 = 6/13:33/13 = 6/13*13/33 = 6/33
stosunek masowy wynosi 6:33