A Chemistry problem for those chemist masterminds out there?

This is on a study guide for a chemistry exam, I understand all the terms and how they can apply but this seems complicated to me.

An aqueous solution containing 288 g of a nonvolatile compound having the stoichiometric composition C(n)H(2n)O(n) in 90.0 g of water boils at 101.24*C at 1.00 atm pressure. What is the molecular formula of the compound?

The answer is C(45)H(90)O(45) but I don’t understand everything it takes to get there. If anyone could help me out it would be much appreciated.