20 = 0.45
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20
This is subtraction of fractions. Hence 9/16 - 9/20 => [9(20) - 9(16)] / (16 x 20) [180 - 144] / 320 [36] /320 Cancel down by '4' 9/80 The answer ; this will not reduce any further.
9/20 divided by 6 = 9/120 or 3/40 in its simplest form
11/20 divded by 9/20 = 11/9
9 divided by 810 is 1/20 or 0.05