A can complete a project in 20 days and B complete the same project in 30 days. If A and B start working in the project together and A quits 10 days before the project is completed, in how many days will the project be completed?
Solution
Correct Answer: Option C
ধরা যাক , x দিনে কাজটি complete হয়েছে B কাজ করেছে x দিনে A কাজ করেছে x-10 দিনে প্রশ্নমতে, x-10/20+x/30=1 or, 5x-30 =60 or,x=18
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