The age difference is 6. I found this by first knowing that bill is 15 because sarah is 30 and twice as old as him. bill is 5 times older than jane so jane is 3 and james mom is 12 times older than jane so she is 36 . Janes mom (36) subtracted from sarah's age (30) is 6.
Yes, you can divide $5 by 2. There are 100 cense in a dollar, 500 in five dollars, if you divide 500 by 2 you get 250 cense, with each 100 cense equaling $1. You would have $2.50.
Also, you got number 5 wrong, it’s how far he’s gone, not how far he has left.