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Prime numbers are: 2 3 5 7 Composite numbers are: 4 6 8 9 10 So the ratio is: 4 to 5
if the numbers are from 1 - 9 then the ratio of even to odd is 4:5 (2, 4, 6 & 8 are even, 1, 3, 5, 7 & 9 are odd)
The ratio of 5 and 7 8 and 9 12 and 18 85 and 170 is 5:7/8:9/12:18/85:170.
4 + 5 = 9, 4/9 x 1800 = 800, 5/9 = 1000
Answer: 28/45 7/9(4/5) is the same as 7(4)/9(5). 7(4) = 28 and 9(5) = 45, so the answer is 28/45.