18/20 + 8/20 - 5/20 = 21/20 or 1 and 1/20
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The sum of 1/2 and 2/5 is 9/10
Overland - Plus or Minus 10 miles; Plus or minus 5 minutes Oversea - Plus or Minus 20 miles; Plus or minus 5 minutes
-5 + (-4) - 12 - 20 - (-10) + 6 = -25
find the denomenator with is 30 10/30 9/30 the answer is 1over 3
20 + 10 - 31 + 30 - 5 = 24