A can do a piece of work in 18 days and B alone can do it in 10 days. B works at it for 5 days and then leaves. A alone can finish the remaining work in  Choices.
A) 5days B) 6days C) 7.5days D) 8.5days E) 9days
9daysxplanation:   B's 5 days work =   1/10∗5=1/2   Remaining work =1−1/2=1/2   A can finish work =18∗1/2=9 days   Option 9days
<result>E</result>
A can do a piece of work in 18 days and B alone can do it in 10 days. B works at it for 5 days and then leaves. A alone can finish the remaining work in