A and B can together finish a work in 10days. They worked together for 5days and then B left. After another 5days, A finished the remaining work. In how many days A alone can finish the job?	Pick:
A) 10 B) 15 C) 20 D) 5 E) 30
10+B 5days work = 5*1/10 = 1/2   Remaining work = 1-1/2 = 1/2   1/2 work is done by 10 in 5days   whole work will be done by 10 in  5*2= 
<gadget id="calculator"> 5*2</gadget>
<output>10</output>
10days   10nswer is 10
<result>A</result>
A and B can together finish a work in 10days. They worked together for 5days and then B left. After another 5days, A finished the remaining work. In how many days A alone can finish the job?