A can do a work in 15 days and B in 20 da… | Answer

Subject

Bank Exam

Topic

Dutch-Bangla Bank Ltd. - Probationary Officer - 2017

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is -
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ক)

1/4

খ)

1/8

গ)

1/15

ঘ)

8/15

Explanation

Solution: প্রশ্নে বলা হচ্ছে যে, A একটি কাজ 15 দিনে এবং B একটি কাজ 20 দিনে করে । তারা একত্রে ঐ কাজটি 4 দিনে করে । ঐ কাজের কত অংশ বাকি থাকে ? A একা 15 দিনে করে = 1 টি কাজ A একা 1 দিনে করে = 1/15 টি কাজ আবার, B 20 দিনে করে = 1 টি কাজ B 1 দিনে করে = 1/20 টি কাজ তারা একত্রে 1 দিনে করে =

(\frac{1}{{15}} + \frac{1}{{20}}) = (\frac{{4 + 3}}{{60}}) = \frac{7}{{60}}

অংশ অর্থাৎ একত্রে 1 দিনে করে = 7/60 অংশ কাজ একত্রে 4 দিনে করে =

\frac{{4 \times 7}}{{60}} = \frac{{28}}{{60}}

অংশ কাজ কাজের বাকি থাকে =

(1 - \frac{{28}}{{60}}) = (\frac{{60 - 28}}{{60}}) = \frac{{32}}{{60}} = \frac{8}{{15}}

অংশ

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A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is -Reading

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is -

Explanation

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A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is -
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