A shop sells toilet rolls in small packs and big packs. There are 5 toilet rolls in a small pack. There are 8 toilet rolls in a big pack. The shop has s s\,s small packs and b b\,b big packs of toilet roll.
Write an expression for the total number of toilet rolls the shop has.
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.