20/455 = 0.04396
You seem to be unaware of the fact that you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
22.75
0.0088
455
455
41.3636
91
75.8333
0.011
0.0154
0.022
0.0637
455/5 = 91/1 = 91