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Time & Work · Question 28 of 61

Question 28

EasyOriginal question

A team of 12 workers can build a compound wall in 15 days. How many workers are needed to build the same wall in 9 days?

Options for question 28

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Total work = 12×15=18012 \times 15 = 180 worker-days.

  2. Workers for 9 days = 180÷9=20180 \div 9 = 20.

Worth noting

Fewer days need MORE workers. 7.2 comes from 12×91512 \times \frac{9}{15}, treating it as direct proportion.

Concept
M₁D₁ = M₂D₂ (inverse proportion)
Typical time
40 s
Your time
—
The rule this testsEfficiency and wages
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Ten questions from Time & Work, at your own pace.

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Ten questions from Time & Work, at your own pace.

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