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20 kg * 6% = 1,2 kg
ile musi być wody, żeby 1,2 kg soli stanowiło 4% roztworu?
X * 4% = 1,2 kg
X = 1,2 kg / 4%
X = 30 kg
ile trzeba dolać?
30 kg - 20 kg = 10 kg
trzeba dolać 10 kg wody.
0.06 razy 20 = 0.04 (20 + w)
1.2 = 0.8 + 0.04 w
0.4 = 0.04 w /razy 100
40 = 4 w /:4
w= 10
(20 kg *6%) + (x *0%) = ((20+x) *4%)
120=80+4x
4x=40
x=10kg
Odp:trzeba dolać 10kg wody.