A brand of shampoo is available in two different bottles.
600 ml for £3.70£3.70£3.70
400 ml for £2.60 £2.60\,£2.60
Work out which bottle offers the best value for money.
You must show your working.
84 exam-style questions on OCR GCSE Maths Best Buy Questions. Each one has a worked solution and a mark scheme showing where the marks go.