11/20
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1 13/20
10 plus 20-2 - 11 plus 3 is equal to 20.
3/20 + 1/10 is the same as 3/20 + 2/20 which equals 5/20 which turns out to be 1/4 or 0.25 in decimal
2/5 + 3/4 - 1/2 equals 8/20 + 15/20 - 10/20 which adds up to 8/20 This equals 4/5
Suppose the answer is x.Then x + 1/2 = 7/20 so that x = 7/20 - 1/2 = 7/20 - 10/20 = -3/20