0.2222
9 divided by 20 is actually equal to 0.45, perhaps someone forgot the decimal place.
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.
20 = 0.45
It is: 9/16-9/20 = 9/80.
20
0.7407
4
1777.7778
20
20
9
18