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xg 96%..............80-75=5
...........80%...............+
yg 75%.............96-80=16
.............................=21
21 części-------150g roztworu
5częsci-----------xg 96% kwasu
x=35,7g kwasu 96%
21 części-------150g roztworu
16częsci---------yg 75% kwasu
y=114,3g kwasu 75%