Each of you is given a 1st-degree statically indeterminate beam required to carry 2 uniformly distributed loads (both already includes beam self-weight). In this design, for the safety, the levels of stresses in any material must not exceed any of the material allowable stresses and for user-confidence reason, displacement cannot exceed the span divided by 30. The connecting nails can resist up to 50 N of shear force (calculating from shear flow).
Determine whether your assigned cross section areas are suitably chosen or not. If yes, state clearly why. If not, state clearly why and recommend changes (no calculation needed here). Note that you should also consider the economical reasons as well.