6 workers take 15 days to complete a job. How long would 10 workers take?
Step 1 Find k (workers × days)
k = 6 × 15 = 90
Step 2 Use k to find new time
days = k ÷ workers = 90 ÷ 10
This study notes covers Worked Example within Inverse Proportion for GCSE Mathematics. Revise Inverse Proportion in Ratio & Proportion for GCSE Mathematics with 15 exam-style questions and 10 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 4 of 6 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for Inverse Proportion
Which of the following correctly reads the mathematical statement y ∝ 1/x?
Explain what it means for y to be inversely proportional to x. Your answer should refer to the equation and the graph.