Hi I Am Really Lost On How To Answer Dead Load Questions For Civil Engineering I Have Tried Using The Aygl

Question 2 0/ 0 ts A floor consists of timber beams with solid rectangular cross-section of 350 x 45 mm, equally
spaced at 600 mm centres. A flat steel pan 2 mm thick and concrete 125 mm thick are laid on
top. Calculate the dead load of the floor system. The unit mass of timber is 600 kg/m3. The unit
mass of concrete is 2,400 kg/m3. The unit mass of steel is 7,850 kg/ms. (Answer in kPa) Engineering Technology