Problem-Solving and Data AnalysisVery hardInverse proportion between workers and time
Problem-Solving and Data Analysis practice question
Six workers, all working at the same rate, build a wall in 10 days. How many days would 4 such workers take to build the same wall?
Answer: 15
The job takes 6 × 10 = 60 worker-days. With 4 workers: 60 ÷ 4 = 15 days.
Common wrong answers
- If you answered 8
- 8 subtracts 2 days for 2 fewer workers.
- If you answered 24
- 24 multiplies 4 by 6.
- If you answered 6.67
- 6.67 scales the time down as if fewer workers were faster.
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