1/8 x 20 = 2.5
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One eighth plus one eighth is one fourth.
if x8 = 20 then x = - eighth root of 20 or x = eighth root of 20 eighth root of 20 = 1.4542154.... Maybe you mean 8x = 20 If so Ln (8x) = Ln (20) => x Ln(8)= Ln(20) => x = Ln(20)/Ln(8) = 1.4406426...
One minus one eighth is seven eighths.
Neither. One eighth is 0.125
three ounces, or three-eighth of a cup