Question 873825
L = cheap coffee price - known
H = expensive coffee price - known
T = price  of blend - known
u = pounds of cheap coffee -UNKNOWN
v = pounds of expensive coffee - UNKNOWN
v/u=2


Accounting for prices,
{{{(L*u+H*v)/(u+v)=T}}} 
and as *given, {{{v/u=2}}}.


The given price values may be inconvenient enough that you should solve the system of equations symbolically for u and v; and then substitute the given values of prices to determine the values of u and v.


* Note, use v=2u to simplify the rational equation and first solve for u.