Question 1184747
Here is only part of the solution, but not the completely finished solution.


n, how many cups of the Orange Juice Concentrate
w, how many cups of water


{{{system(w/n=7/3,w+n=80)}}}


{{{system(3w=7n,w+n=80)}}}


{{{system(3w-7n=0,w+n=80)}}}


{{{system(3w-7n=0,3w+3n=240)}}}

{{{E2-E1}}}:

{{{10n=240}}}

{{{highlight_green(n=24)}}}  and from this, {{{highlight_green(w=56)}}}


Maybe you could go through the rest of a solution and solve the question asked for.