Posted by afo on Friday, December 4, 2009 at 1:12pm.
Draw a picture and figure it out. Put students at 20 degree increments around the circle. The largest number minus the smallest, across from each other, must equal 9.
#1=9
#5=12
#18=8
Just another thought.
N = number of students equally spaced around the circle and numbered sequentially.
The student number opposite a given student number is defined by Sopp = Sg +/- N/2 depending on whether the given student number is less/more tan N/2.
The student opposite student #1 = 1 + 18/2 = #10.
The student opposite student #5 = 5 + 18/2 = #14.
The student opposite student #18 is 18 -- 18/2 = 9.
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