২০ জন লোক একটি কাজ ১০ দিনে করতে পারে । ঐ কাজ ৫দিনে সম্পন্ন করতে হলে কতজন লোক লাগবে ?
A. ৬০জন
B. ৪০জন
C. ৩০জন
D. ২৫জন
সঠিক উত্তরঃ
B.
৪০জন
Explanation:
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