20. unless this is a trick question.
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∙ 2009-11-03 00:23:112 plus 8 equals 10.
-10 + 8 = -2
8 + 2 = 10
10?
N= -2 5 * -2 is -10 -10 +2 is -8
273 13+8 = 21 and 13*21 = 273
6
8
13
r=2
2+4+8+2+10+6 = 6+8+2+10+6 = 14+2+10+6 = 16+10+6 = 26+6 = 32
The original questions is in parenthesis,71 plus 2 = 10 22 plus 31 =8 111 plus 22 =7(71) 7+1 "plus" 2 (2) = 10, (22) 2+2 (plus) (31) 3+1=8, (111) 1+1+1 "plus" (22) 2+2=7