1990/20 ÷ 20 = 199/40 or 439/40
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20/50 = 40%
.05 or 1/20
20/100 ÷ 20 = 1/100 or 0.01
7/4 divided by 5/7 is 2 9/20
well, half of 40 is 20. 20 divided by 2 = 10 and 40 divided by 2 = 20 so now you have 10 over 20. then: 10 dived by 2 = 5 and 20 dived by 2 = 10 so now you have 5 over 10, and 5 is half of 10 so it is 1 over 2.