It is (8+6+11+12+13)/5 = 10
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6/13 divided by 6/12 = 6/13 * 12/6 = 72/78 (reducible to 12/13) This is immediately confirmed because dividing by 6/12 or 1/2 is effectively multiplication by 2.
13
5 with a remainder of 4
13.3333
(1+2+3+4+5+6+7+8+9+10+11+12)/13 = 6