Mark and Joe are partners in a business. They invested $250 and $300 respectively in the business. If they sell the business for $750, how much will each of them get?
The total investment made by both partners is $250 + $300 = $<<250+300=550>>550.
Since they are the only two partners, they will divide the selling price of $750.
So, Mark will get $250/$550 x $750 = $<<250/550*750=340.9091>>340.9091.
And Joe will get $300/$550 x $750 = $409.0909. Answer: \boxed{340.9091, 409.0909}.