Question 1172522
<pre>
               MAC           JACK

ORIGINAL         m            j
ORIGINAL        0.8*j         j

STEP1           0.8j-48       j+48

RESULT         2(0.8j-48)=j+48       
</pre>
Not the only way, but {{{2(0.8j-48)=j+48}}}, solve, and then evaluate {{{0.8j}}}.

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{{{1.6j-96=j+48}}}

{{{0.6j=48+96}}}

{{{j=(48+96)/(0.6)}}}

{{{highlight_green(j=240)}}}


{{{4/5}}} of j is  {{{(4/5)*240=highlight(192=m)}}}.