Tea bags are sold in small boxes and large boxes. There are 100 tea bags in a small box. There are 240 tea bags in a large box. Mae buys x x\,x small boxes and y y\,y large boxes of tea bags.
Verify that the total number of tea bags Mae buys is 100x+240y100x + 240y100x+240y.
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.