30. 12 men can complete a work in 90 days. 30 days
after they started work, 2 men left and 8 men
joined. How many days will it take to complete
the remaining work?
12 आदमी किसी कार्य को 90 दिनों में कर सकते हैं। कार्य प्रारंभ
होने के 30 दिनों के बाद 2 आदमियों ने कार्य छोड़ दिया और 8
आदमी शामिल हो गए। शेष कार्य को पूरा करने में कितने दिन
लगेंगे?
(1) 90 days/दिन (2) 60 days / दिन
(3) 40 days / fast (4) 50 days / दिन
Answers
Step-by-step explanation:
After 30 days if 12 men only were working it would have taken 60 more days. ie., (12)(60) mandays.
But after 30 days, 2 men leave and 8 men join. So now there are 12–2+8 = 18 men. Suppose the 18 men take x days to finish the remaining work. That is 18 x mandays.
Hence we have 18x = (12)(60)=> x = (12)(60)/18 = 40 days.
So 18 men take 40 days to finish the remaining work.
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Answer:
After 30 days if 12 men only were working it would have taken 60 more days. ie., (12)(60) mandays.
But after 30 days, 2 men leave and 8 men join. So now there are 12–2+8 = 18 men. Suppose the 18 men take x days to finish the remaining work. That is 18 x mandays.
Hence we have 18x = (12)(60)=> x = (12)(60)/18 = 40 days.
So 18 men take 40 days to finish the remaining work.