Question 896383
p, c, r for the pounds of peanuts, chocolate, and raisins.


Setup equations.
p+c+r=20; p/r=2; c=r.


Those are not yet enough but before continuing, we can do more with these three.


p=2r and because c=r, eliminate one of these variables.  Possible choice, substitute for r.

p+c+c=20; {{{p=2c}}}
{{{p+2c=20}}}.


PRICE ACCOUNTING:
{{{highlight_green((2.4p+1.8c+3.2r)/20=PRICE)}}}
but you do not know this until you solve for p and c; and then find r.
First solve this system:
{{{highlight_green(system(p+2c=20,p=2c))}}}
Remember, {{{c=r}}}.



BIG HINT: by substitution, 2c+2c=20, .....


Note, I did not finish this; but only pointed clear direction.