Question 1041597
Just add water to the tank?  What is this expected final volume?


v, volume of water to add to the 75 gallons of 1% solution;


{{{75*0.01/(75+v)=0.004}}} as decimal fractions;


{{{75*1/(v+75)=0.4}}} as percents


{{{75=0.4(v+75)}}}


{{{750=4v+4*75}}}


{{{4v=750-4*75}}}


{{{4v=450}}}


{{{highlight(v=450/4=highlight_green(112.5))}}}
Now, is this enough or too much for the 200 gallon tank?
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{{{112.5+75=187.5<=200}}}