oblicz ile wody należy dodać do 300g solanki o Cp= 20% jeżeli mamy otrzymać roztwór o stężeniu 10% daje naj !!!!!!!!!!!!!!!!!!!!!!!
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300g 20% .......................10-0 = 10
.......................10%
xg 0% ............................20-10=10
300/x = 10/10
10x = 3000
x = 300g wody