A and B can do a piece of work in 30 days and 30 days respectively. They work together for 10 days and B leaves. In how many days the whole work is completed? Choose the most appropriate option:  A) 30days  B) 35days  C) 40days  D) 45days  E) 50days
Explanation:   (30days+B)’s 10 days work = 10[1/30+1/30]=10[1+1/30]= 2/3   30days complete remaining work in   2/3*30= 
<gadget id="calculator">  2/3*30</gadget>
<output>20</output>
20   Total work= 10+20= 
<gadget id="calculator">10+20</gadget>
<output>30</output>
30days   30daysnswer: Option 30days
<result>A</result>
A and B can do a piece of work in 30 days and 30 days respectively. They work together for 10 days and B leaves. In how many days the whole work is completed?