Simply supported beam, L=6m, f鈥檆=21 MPa, fy=415 MPa, DL=20 kN/m (incl. self), LL=15 kN/m.
Here is a distilled, simplified workflow for designing typical RC elements based on the 2015 code. You would keep this cheat sheet next to your PDF. Simplified Reinforced Concrete Design 2015 Nscp Pdf