A can do a piece of work in 20 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  Choose the correct choice from the following answers
A) 10days  B) 6days  C) 7.5days  D) 8.5days  E) 9days
Explanation:   B's 5 days work =   1/10∗5=1/2   Remaining work =1−1/2=1/2   10days can finish work =20∗1/2=10days   Option 10days
<result>A</result>
A can do a piece of work in 20 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