চারটি মেশিন একই গতিতে একসাথে কাজ করে ৬ দিনে - x টি কলম উৎপাদন করতে পারে। ঐ একই গতিতে ৪ দিনে ৩x টি কলম উৎপাদন করতে কতটি মেশিনের কাজ করতে হবে?
A. ২৪
B. ১৮
C. ১৬
D. ১২
সঠিক উত্তরঃ
B.
১৮
Explanation:
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