The cost of printing photos (C C\,C pence) is directly proportional to the number of photos printed (nnn).
C C\,C is given by the formula: C=12nC = 12nC=12n
Find the number of photos printed if the total cost is 156 pence.
50 exam-style questions on AQA GCSE Maths Direct and Inverse Proportion. Each one has a worked solution and a mark scheme showing where the marks go.