4/20 = 0.2
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As a fraction, 4/5. As a decimal, 0.8.
7/20 = 0.35
3/20 = 0.15
It is easier to add two fractions together if you convertb them to the same values. You can convert both of these fractions to 20ths quite easily. 3/4 is equal to 15/20ths and 9/10ths is equal to 18/20ths, Simply add them together to find 15/20 + 19/20 = 34/20 now reduce this to a proper fraction... 1 and 14/20ths which can be simplfied to 1 and 7/10ths.
11/20, as a fraction cannot be simplified. It is equal to 0.55