There are two chains of $CH_3CH_2$ connected to a carbon which is connected to an oxygen.
Work Step by Step
The condensed formula is $(CH_3CH_2)_2CO$. The subscript of 2 indicates that there are 2 chains of $CH_3CH_2$ attached to the Carbon which is double bonded to an oxygen. The Oxygen has two lone pairs of electrons. Each carbon has four bonds, Oxygen has two bonds and hydrogen has one bond.