Floor tiles are sold in Type A crates and Type B crates. There are 24 tiles in a Type A crate. There are 80 tiles in a Type B crate. An architect orders n n\,n Type A crates and m m\,m Type B crates.
Write an expression for the total number of floor tiles the architect orders.
267 exam-style questions on OCR GCSE Maths Writing an Expression. Each one has a worked solution and a mark scheme showing where the marks go.