Question 906232
Assuming percent is weight per weight and "oz" is {{{1/16}}} of a pound, 


Let x = how many ounces of water to add;
{{{80*35/(80+x)=14}}}
{{{80*35=14(x+80)}}}
{{{14x+14*80=80*35}}}
{{{14x=80*35-80*14}}}
{{{14x=80(35-14)}}}
{{{14x=80*21}}}
{{{x=40*3}}}
{{{highlight(x=120)}}}