Inverse Proportion — O/L Mathematics

How do I practise Inverse Proportion?

1 question with a worked solution

1. 6 workers take 12 days to complete constructing a boundary wall. How many days will it take for 9 workers working at the same rate to complete the same wall?
   1. A) 6 days
   2. B) 9 days
   3. C) 10 days
   4. D) 8 days
   Check my answer

   Correct answer: D) 8 days

   Work is inversely proportional: Total man-days = 6 workers × 12 days = 72 man-days. Days required by 9 workers = 72 / 9 = 8 days.

   Show worked solution

   Step 1: Calculate total work in man-days: Work = Workers × Days = 6 × 12 = 72 man-days. Step 2: Relate work to new workforce: 9 × Days = 72. Step 3: Solve for Days: Days = 72 / 9 = 8 days. Answer: 8 days.
   Modelled on: the O/L Mathematics examination pattern

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Where does Inverse Proportion fit in the syllabus?

Grade 10 · Term 1