Question 1157273
Another one of these


Want 91%
Available 90% and 95%
The difference from 90 to 95 is in 5 equal parts and you want {{{4/5}}} of the mix to be from the 90%.


u of the 90%
15-u of the 95%
{{{90u+95(15-u)=91*15}}}
-
{{{90u-95u+95*15=91*15}}}
{{{(90-95)u=91*15-95*15}}}
{{{v=(15(91-95)/(90-95))}}}

{{{highlight(v=15(4/5))}}}-------------------12 liters of the 90% sugar, cherry-flavored solution.