x wody (0%) + 400g roztworu (20%) = x + 400g roztworu (15%)
20% * 400 = 15% * (x + 400)
0,2 * 400 = 0,15 * (x + 400)
80 = 0,15x + 60
8000 = 15x + 6000
8000 - 6000 = 15x
2000 = 15x |:15
133,(3) = x
Należy dolać 133,(3) gram wody.
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x wody (0%) + 400g roztworu (20%) = x + 400g roztworu (15%)
20% * 400 = 15% * (x + 400)
0,2 * 400 = 0,15 * (x + 400)
80 = 0,15x + 60
8000 = 15x + 6000
8000 - 6000 = 15x
2000 = 15x |:15
133,(3) = x
Należy dolać 133,(3) gram wody.