Question 569581
7/9 , 9/11 , 11/13 , 13/15
so we know its between 13 and 15 dollars
it makes since that its adding a dollar more per rose
 3 for 5   4 for 6   5 for 7   6 for 8   7for 9
so 11 for 13 , 12 for 14 , 13 for 15
12 for 14 dollars