2 = 20/10
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2/5 + 3/4 - 1/2 equals 8/20 + 15/20 - 10/20 which adds up to 8/20 This equals 4/5
As a decimal it equals .2 and as a percentage it equals 20%
9 over 20 equals 45%
Suppose the answer is x.Then x + 1/2 = 7/20 so that x = 7/20 - 1/2 = 7/20 - 10/20 = -3/20
Given that X/2 = 12/20 multiply each side by 2, then 2X/2 = 24/20 simplifying the fractions, X = 1.2