David and Elijah each spent the same amount of money. David has 1/4 of his money left and Elijah had 3/5 of his money left. What was the ratio of the amount of money David had at first to the amount of money Elijah had at first?
There have been many questions recently very similar to this.
This is one of the easier ones.
Let D be the amount David starts with and E be the amount that Elijiah starts with. You want to find D:E
If David has a quarters of D left he must have spent (3/4)D
If Elijah has 3/5E left he must have spent (2/5)E
They both spent the same amount so you can take it from there.