A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work? Pick:	A) 60	B) 50	C) 40	D) 30	E) 20
Explanation :   60mount of work done by 60 and B in 1 day = 1/30   60mount of work done by 60 and B in 20 days = 20 × (1/30) = 20/30 = 2/3   Remaining work – 1 – 2/3 = 1/3   60 completes 1/3 work in 20 days   60mount of work 60 can do in 1 day = (1/3)/20 = 1/60   =&gt; 60 can complete the work in 60 days   60nswer : Option 60
<result>A</result>
A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work?