Well, to understand what "n" is, we have to understand the relation between 18 and 27. If we divide by 9, we'll notice that 18/27 simplifies to 2/3. So, let's apply this to 10/n 10 over n must be the same ratio of 2/3. 10/2 is 5. 5*3 = 15. n = 15. Alternatively, cross multiply and solve. 10/n = 18/27 n will multiply with 18, 10 with 27. 18n = 270 /18 /18 n = 15
