Depending if the 5 is in the "over 20" or not. Because what you stated is unclear, it can be (5+7)/20 or 5+7/20, which is two different answers, 0.6 and 5.35.
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Expressed as a decimal, 5 7/20 is equal to 5.35.
The decimal of 5 and 7 over 50 is expressed as 5.14
.7
5 over 7 (or 5 divided by 7) is equal to 0.714285714.
It is: 7/20 = 0.35 as a decimal