d d\,d is inversely proportional to c c\,c
When d=25d = 25d=25, c=4c = 4c=4
Find the value of d d\,d when c=20c = 20c=20
Practise Edexcel GCSE Maths Direct and Inverse Proportion with exam-style questions for Foundation and Higher tier. 96 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 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.