Ashifur August 8, 2023 - 14:42
Problem: ক ও খ মিলে একটি কাজ ৩ দিনে করে। ক সেই কাজটি একা ৫ দিনে করতে পারে । খ একা কাজটি কয় দিনে করতে পারবে?

View all: BANGLADESH BANK BANKERS | WRITTEN QUESTION (MATH) SOLVE | 1988

Correct Answer: উত্তরঃ কাজটি $৭\frac{১}{২}$ দিনে করতে পারবে।

Explanation:

মনে করি, কাজটি ১ অংশখ ১ দিনে কাজ করে =$\frac{১}{৩}-\frac{১}{৫}$=$\frac{২}{১৫}$অংশ

খ$\frac{২}{১৫}$ অংশ কাজ করতে পারে = ১ দিনে

খ ১ অংশ কাজ করতে পারে = $\frac{১\times ১৫}{২}$=$৭\frac{১}{২}$

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