N can do a piece of work in 80 days. He w… | Answer

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Govt.Jobs

Topic

সিকিউরিটি প্রিন্টিং কর্পোরেশন লি. সহকারি ব্যবস্থাপক (সাধারণ)-২৬.১১,২০২১

N can do a piece of work in 80 days. He works at it for 10 days and then M alone finishes the remaining work in 42 days. In how much time will N and M, working together, finish the work?
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ক)

24 days

খ)

30 days

গ)

36 days

ঘ)

20 days

Explanation

এখানে ,N,80 দিনে করে =1 অংশ N,10 " " =10/80 =1/8 অংশ বাকি =1-1/8=7/8 অংশ M,7/8 অংশ করে 42 দিনে অতএব, 1 " "(42× 8)/7=48 দিনে অতএব,M ও N একত্রে কাজটি করে (48×80)/(48+80) =(48×80)/128 =30 দিন

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N can do a piece of work in 80 days. He works at it for 10 days and then M alone finishes the remaining work in 42 days. In how much time will N and M, working together, finish the work?Reading

N can do a piece of work in 80 days. He works at it for 10 days and then M alone finishes the remaining work in 42 days. In how much time will N and M, working together, finish the work?

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N can do a piece of work in 80 days. He works at it for 10 days and then M alone finishes the remaining work in 42 days. In how much time will N and M, working together, finish the work?
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