Posted by clolyne on Wednesday, August 24, 2011 at 9:11pm.
totalbefore=n*180
total after=(n+1)159
but total after is total before+54
total before=n*180
total before+54=(n+1)159
or n*180=(n+1)159 -54
solve for n
n*180-159n=159-54
n=105/21=you do it.
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