A can finish a piece of work in 5 days. B can do it in 10 days. They work together for 1 day and then A goes away. In how many days will B finish the work? Choose the correct choice from the following answers: A) 8 days B) 5 days C) 6 days D) 7 days E) 9 days
1/5 + (1 + x)/10 = 1 =&gt; x = 7 days   Answer: 7 days
<result>D</result>
A can finish a piece of work in 5 days. B can do it in 10 days. They work together for 1 day and then A goes away. In how many days will B finish the work?