A does a work in 10days and B does the same work in 15days. In how many days they together will do the same work?
Select
A) 3	B) 5	C) 6	D) 8	E) 10
A+B can finish =AB/A+B = 10*15/(10+15)= 
<gadget id="calculator">10*15/(10+15)</gadget>
<output>6</output>
6days   Answer is 6
<result>C</result>
A does a work in 10days and B does the same work in 15days. In how many days they together will do the same work?