Now try this one on your own!
Jim has 7 times as much money as John, but if Jim earns $4, and John earns $8, Jim will have 5 times as much money as John will have then. How much do Jim and John have before and after earning the $4, and $8, respectively?
John: $18 (before) , $26 (after) ,
Jim: $126 (before) , $130 (after)