যদি একটি কাজ 9 জন লোক 12 দিনে করতে পারে, অতিরিক্ত 3 লোক করলে কাজটি কত দিনে শেষ হবে?
A. 7 দিনে
B. 9 দিনে
C. 10 দিনে
D. 12 দিনে
সঠিক উত্তরঃ
B.
9 দিনে
Explanation:
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