y*49/39 = 7/13 => y = 3/7
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No
13/49 is in its lowest terms
39 49 69 99 are not a prime numbers because they have other factors aside from 1 and themselves. The other factors of: 39 = 3, 13 49 = 7 69 = 3, 23 99 = 3, 9, 11, 33,
39 = 3 x 13 49 = 7 x 7 51 = 3 x 17 43 is prime 31 is prime
It is: 13/49 times 100 = 27% to nearest whole percent