Question 1029941
z for cashews
x and y for the peanuts, cheap and expensive in that order
{{{x/y=2}}}
from which
{{{x=2y}}}



Poundage:  {{{x+y+z=140}}}


Mixture Price:  {{{(3x+4y+8z)/(140)=6}}}


Make the substitution for x, and simplify into the TWO variable system:
{{{system(3y+z=140,10y+8z=6*140)}}}
further simplifiable to
{{{highlight(system(3y+z=140,5y+4z=420))}}}-------------solve this system for y and z, and then find x from the earlier given equation from the description.