Question 703561
Volume of low percent mixture =V[b], a variable unknown
Concentration of low percent mixture as decimal fraction = P[b]
Volume of high percent mixture = V[a]
Concentration of high percent mixture decimal fraction = P[a]
Target concentraation percent as decimal fraction = P[t]


{{{V[b]}}} is unknown and we need to find.
{{{P[b]}}} = 0.25
{{{V[a]}}} = 14 "ounces"
{{{P[a]}}} = 0.30
{{{P[t]}}} = 0.26


Setup rational equation representing {{{V[b]}}} that we want to add to get {{{P[t]}}} as a result:
{{{(V[b]*P[b]+V[a]*P[a])/(V[b]+V[a])=P[t]}}}


Solve for {{{V[b]}}},  and then substitute the known values.