0.35
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That is 45%.
7/20 = 0.35
7 over 20 equals 0.35 in decimals, which is the same as 35 %.
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.
2/5ths = 4/10ths = 8/20ths = 16/40ths = 20/50ths = 40/100ths