Asked by Janiyah

After selling half their card collections, DeShawn and Stephanie each buy 9 new cards. What is the ratio of the number of cards DeShawn has to the number Stephanie has?
Answered by oobleck
If they started out with d and s cards, respectively, then
(d/2 + 9)/(s/2 + 9) = (d+18)/(s+18)