Question 1143346
{{{system(a+b=150,67*a+7b=47*150)}}}


{{{67a+7(150-a)=47*150}}}----------solve first for a.

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{{{67a+7*150-7a=47*150}}}

{{{(67a-7a)+7*150=47*150}}}

{{{(67-7)a=47*150-7*150}}}

{{{(67-7)a=150(47-7)}}}

{{{highlight_green(a=150((47-7)/(67-7)))}}}

or more simplified

{{{highlight_green(a=150(2/3))}}}----------volume liters of the 67% juice concentrate