original-statues=amount left
original=240
amount left=72
statues=cost per statue times cost per statue=c times 8=8c (if we use c as the cost per statue)
240-8c=72
minus 240 from both sides
-8c=-168
divide both sides by -8
c=21
each statue cost $21
Each one cost $21.
$240-$72=$168
$168/8=$21
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