Question 1112659
25% target is three-quarters of the way from 10% to 30%.
25% is closer to 30% than it is to 10%, so need more of the 30% than the 10%.


{{{(3/4)*20=15}}}, gallons of the 30% acid


{{{(1/4)(20)=5}}}, gallons of the 10% acid.



Does that pair of results work?

{{{5*0.10+15*0.30=20*0.25}}}

{{{0.5+4.5=5}}}

{{{5.0=5}}}------true


The answer found works.
5 gallons of the 10%
and 15 gallons of the 30%