A brand of shampoo is available in two different bottles.
900 ml for £5.50£5.50£5.50
400 ml for £2.50 £2.50\,£2.50
Work out which bottle offers the best value for money. You must show your working.
24 exam-style questions on Edexcel GCSE Maths Best Buy Questions. Each one has a worked solution and a mark scheme showing where the marks go.