Subject
Quantitative Aptitude
Topic
Time and Work
If 3 men or 9 boys can finish a piece of work in 21 days,in how many days can 5 men and 6 boys together do the same piece of work?
If 3 men or 9 boys can finish a piece of work in 21 days,in how many days can 5 men and 6 boys together do the same piece of work?
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8খ)
12গ)
14ঘ)
none of theseExplanation
(প্রশ্ন- যদি ৩ জন পুরুষ বা ৯ জন বালক একটি কাজ ২১ দিনে করতে পারে।তাহলে ৫ জন পুরুষ এবং ৬ জন বালক একত্রে একই কাজ কত দিনে করতে পারবে?) ৩ জন পুরুষ ২১ দিনে সম্পন্ন করে ১ অংশ ১ জন পুরুষ ১ দিনে সম্পন্ন করে ১/(২১ ×৩) =১/৬৩ অংশ ৯ জন বালক ২১ দিনে সম্পন্ন করে ১ অংশ ১ জন বালক ১ দিনে সম্পন্ন করে ১/(৯ ×২১)=১/১৮৯ অংশ ৫ জন পুরুষ এবং ৬ জন বালকের ১ দিনের সম্পন্ন কাজ =(৫/৬৩)+(৬/১৮৯) =(৫/৬৩)+(২/৬৩) =(৫+২)/৬৩ =৭/৬৩ =১/৯ অতএব ৫ জন পুরুষ এবং ৬ জন বালক একত্রে কাজটি ৯ দিনে করতে পারবে।Related questions
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