Question 1206035
<pre>
Alicia       3x           3x+(21-n)
Ben          8x           8x-21
Don          4x           4x+n
</pre>

{{{system(3x-n+21=8x-21,8x-21=4x+n)}}}

-

{{{system(-5x-n=-42,4x-n=21)}}}


{{{system(5x+n=42,4x-n=21)}}}


ADD correspondings....

{{{9x=63}}}

{{{highlight_green(x=7)}}}


Ben initially had {{{8*7=highlight(56)}}} apples.