Division
posted by Brian .
3y18/35 divided by y6/15y

Here are some links on dividing fraction:
http://search.yahoo.com/search?fr=mcafee&p=division+of+fractions
Sra 
you must mean
(3y18)/35 ÷ (y6)/(15y) , then
= 3(y  6)/35 * 15y/(y6)
= 15y/7 , y ≠ 6