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A can complete a project in 20 days and B can complete the same project in 30 days. A and B start working on the project together and A quits 10 days before the project is expected to be completed. How many days in total will the project take to complete ?

A can complete a project in 20 days and B can complete the same project in 30 days. A and B start working on the project together and A quits 10 days before the project is expected to be completed. How many days in total will the project take to complete ? Correct Answer 18 days

1 দিনে A ও B একত্রে করে ( 1/20 + 1/30) = 1/12 অংশ B 10 দিনে করে 10/30 অংশ = 1/3 অংশ অবশিষ্ট ( 1 - 1/3) = 2/3 অংশ A ও B একত্রে 1/12 অংশ করে 1 দিনে A ও B একত্রে 1 অংশ করে = ( 12 ×1) দিনে A ও B একত্রে 2/3 অংশ করে = 12 × 2 /3 = 8 দিনে মোট সময় লাগে ( 10 + 8) দিন = 18 দিন

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