A shop sells washing powder in 1000g packs.
Sofia has no washing powder. She estimates that she does 4 washes a week, using 50g each wash.
Sofia wants to buy enough washing powder for 20 weeks.
How many packs of washing powder does Sofia need to buy?
218 exam-style questions on OCR GCSE Maths Calculation Problems. Each one has a worked solution and a mark scheme showing where the marks go.