It depends on exactly what scale is used, but for almost all, that would be an F.
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First, you convert them to 100. 4/20=16/100 The subtract 16 out of 100. 100-16=84
19/20 as a percentage = 100*19/20 = 95%
65
20-3 = 17 and 17/20 = 85/100 = .85 or 85%. Percent is a ratio per cent or 100. Multiplying both the 20 and the 17 by 5 will make the denominator 100 and the percent sought after.
65% or D