It takes 6 workers 10 days to build a wall. All workers work at the same rate. How many days would 4 workers take?
Answer and explanation
Correct answer: B. 15 days
- Step 1: The total work is 6 x 10 = 60 worker-days.
- Step 2: With 4 workers: 60 / 4 = 15 days.
Answer
15 days.
Why not the others: 7 days multiplies in the wrong direction (about 4 x 10 / 6), 14 days is 10 + 4 and 20 days assumes fewer workers need exactly double the days.
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