Mathematix1981

The answer is $\frac{47}{95}$

We start with 2. 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77, 82, 87, 92, 97. So the answer is $\boxed{97}$

18, trust me since you must combine like terms, then plug in two variables to group terms, and finally multiply the value of the variables after you compare the two expressions that you get by first combining like terms, then grouping terms with variables.