আরিফ একটি কাজ ৬০ দিনে করতে পারে। আরিফ এবং বাবর এক সাথে মিলে ঐ ৈকাজ ২০ দিনে শেষ করতে পারে। বাবর একা কতদিনে ঐ কাজ শেষ করতে পারবে?

A

৩০

B

৪৫

C

৬০

D

কোনোটিই নয়

উত্তরের বিবরণ

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Updated: 5 days ago

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