Question 3 ("Opts A 2.7 m high wall consists of solid rectangular timber columns with cross-section 90 X 45 mm, equally spaced at 450 mm centres. The...

Hi, I am very confused on how to answer dead load questions for civil engineering. I have tried using the AygL method but nothing is helping. For example here is a question from a quiz I have to answer and got wrong that I have attached. I am so lost on how to answer all loads questions

• Attachment 1
• Attachment 2

Question 3 (”Opts A 2.7 m high wall consists of solid rectangular timber columns with cross-section 90 X 45 mm,equally spaced at 450 mm centres. The wall has plasterboard of mass 7 kg/m2 on both sides. Calculate the dead load of the wall per unit wall length. The unit mass of timber is 600 kg/m3.(Answer in N/m). 328