Multiple choice

A certain number of men can complete a job in 30 days. If there were 5 men more, it could be completed in 10 days less. How many men were in the beginning? कुछ निश्चित आदमी किसी कार्य को 30 दिनों में कर सकते है. यदि 5 आदमी और होते तो कार्य 10 दिन पहले ख़त्म हो जाता । तो प्रारम्भ में कितने आदमी थे?

  1. 10

  2. 15

  3. 20

  4. 25
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A Correct answer
Explanation

Let initial men = m, total work = W. Work done is constant: m×30 = (m+5)×20. So 30m = 20m + 100, giving 10m = 100, hence m = 10 men.

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