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Figure $1$ shows part of the floor system of the private rooms in a multifamily residential building. The overall dimensions of the floor system plan are $L_1=30ft$ and $L_2=42ft.$ The floor consists of $6$ in thick reinforced concrete slab resting on four steel floor beams $AB,CD,EF$ and $GH,$ which are supported by two steel girders $AG$ and $BH.$ The girders are supported by four columns at $A,B,G$ and $H$ as shown in Fig. $1$ below.

The building includes Masonry exterior walls of $10-$ft height. These walls are made of $8-$in hard Masonry $($Brick$)$ hard blocks $($with low absorption$).$ Meanwhile, the floor finishing consists of Marble tiles and mortar on a $2-$in thick layer of clean and dry sand as shown in Figure $2.$

Use the ASCE$7-10$ standards to calculate the following loads:

The load acting on Beam $AB$ due to the weight of the exterior walls only.

The load acting on Beams $AB$ and $CD$ due to the weight of the floor finishing only.