Multiple choice

40 men can do a piece of work in a given time. If only 30 men be engaged, 6 more days are needed to complete the work. In how many days can 60 men do the work? 40 आदमी किसी काम को एक निश्चित समय में समाप्त कर सकते हैं । यदि 30 आदमी काम पर लगाए गए, उसी काम को समाप्त करने में 6 दिन अधिक लगते हैं । 60 आदमी उसी काम को कितने दिनों में समाप्त करेंगे?

  1. 9

  2. 10

  3. 12

  4. 15

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let original time = D days. Work = 40D man-days. With 30 men: 30(D+6) = 40D, giving D = 18 days. Total work = 720 man-days. Time for 60 men = 720/60 = 12 days.