If Charlie were one year older, he would be half Pat's age. In two years, he will be half her age then. How old are they now? (Hint: Neither one is yet a teenager.)
It appears to solve to a series:

0 and 2 : 1/2 2/4
1 and 4 : 2/4 3/6
2 and 6 : 3/6 4/8
3 and 8 : 4/8 5/10
4 and 10 : 5/10 6/12
5 and 12 : 6/12 7/14
6 and 14 : but I guess one is a teen then...

-jk