Do 150g roztworu o stężeniu 15% dodano 200ml wody. Jakie jest stężenie otrzymanego roztworu?
15%------------x
--------X--------
0%-----------15-x
(15-x)/x=200/150
(15-x)/x=20/15
(15-x)/x=4/3
3(15-x)=4x
45-3x=4x
7x=45 /:7
x=6,42%
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15%------------x
--------X--------
0%-----------15-x
(15-x)/x=200/150
(15-x)/x=20/15
(15-x)/x=4/3
3(15-x)=4x
45-3x=4x
7x=45 /:7
x=6,42%