allery15 জন কর্মীর একটি দল একটি কাজ 30 দিনে শেষ করতে পারে। 10 দিন পর, আরও 5 জন কর্মী যোগ দেন। বাকি কাজটি সম্পন্ন হতে সময় লাগে
A18 দিন
B15 দিন
C12 দিন
D10 দিন
Answer & Solution
Correct answer: B. 15 দিন
বাকি কাজ হলো 15 x 20 = 300 worker-days, এবং 20 জন কর্মী এটি 15 দিনে শেষ করেন।
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