A can do a piece of work in 12 days. He worked for 15 days and then B completed the remaining work in 10 days. Both of them together will finish it in.	Choose the correct choice from the following answers:	A) 12 1/2 days	B) 5 days	C) 8.5 days	D) 2 days	E) 11.5 days
12 1/2 daysnswer: Option 12 1/2 days   15/25 + 10/x = 1 =&gt; x = 25   1/25 + 1/25 = 2/25   25/2 = 12 1/2 days
<result>A</result>
A can do a piece of work in 12 days. He worked for 15 days and then B completed the remaining work in 10 days. Both of them together will finish it in.