Pens are sold in small packs and large packs. There are 12 pens in a small pack. There are 50 pens in a large pack. Lucas buys s s\,s small packs and l l\,l large packs of pens.
Write an expression for the total number of pens Lucas buys.
Practise OCR GCSE Maths Writing an Expression with exam-style questions for Foundation and Higher tier. 64 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.