Potatoes cost £9 £9\,£9 for a 12.5 kg bag at a farm shop.
The same type of potatoes cost £1.70 £1.70\,£1.70 for a 2.5 kg bag at a supermarket.
Where are the potatoes the better value, at the farm shop or at the supermarket?
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.