The weight of a piece of wire (w w\,w grams) is directly proportional to its length (l l\,l cm).
w w\,w is given by the formula: w=30lw = 30lw=30l
Find the length of a wire weighing 75 grams.
Practise OCR GCSE Maths Direct and Inverse Proportion with exam-style questions for Foundation and Higher tier. 96 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.