Mrs Tan and Mr Goh are bakers who each baked the same total number of buns yesterday: 120 buns, made up only of cream buns and red bean buns. Mrs Tan baked 15 more cream buns than Mr Goh. Mr Goh baked 30 cream buns. Each cream bun sells for $1.20 and each red bean bun sells for $0.80. Each cream bun weighs 80 g and each red bean bun weighs 70 g. (a) Whose buns are worth more in total sales value, and by how much? (b) What is the total weight of Mr Goh's buns, in kilograms?
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