A can complete a project in 10 days while B can complete same project in 30 days. If A and B start working together and A leaves the work 10 days before completion of project, then in how many days the project will be completed? Answers:
A) 15 B) 19 C) 20 D) 21 E) 22
A's 1day work=1/10;   B's 1day work=1/30;   (A+B) 1day work=(1/10+1/30)=2/15;   It is given that A leaves the work 10 days before completion of the project..   Thus,B alone does the remaining job in 10 days.   So,In 10 days ,B can do 1/3 w ..   Thus,(A+B) have worked (1-1/3)=2/3 w..   (A+B)can do 2/15 work in 1 day...   They did 2/3 w in 5 days.   Total days=(5+10)= 
<gadget id="calculator">(5+10)</gadget>
<output>15</output>
15   15NSWER:15
<result>A</result>
A can complete a project in 10 days while B can complete same project in 30 days. If A and B start working together and A leaves the work 10 days before completion of project, then in how many days the project will be completed?