Think about the following list of number pairs. Three is the first number of a pair and 8 is the second number.
3-8
4-11
5-14
6-17
10-29
If 50 is the first number what is the second number?
If 200 is the first number what is the second number?
If 89 is the second number what is the first?
If a number n is the first number, what is the second number?
