ile wody należy dodać do 500g roztworu 20%, aby otrzymać roztwór 8% ?
500g 20% ................... 8-0=8
.....................8%
xg 0% ........................20-8=12
500/x = 8/12
8x = 6000
x = 750g wody
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500g 20% ................... 8-0=8
.....................8%
xg 0% ........................20-8=12
500/x = 8/12
8x = 6000
x = 750g wody