A can do a work in 7 days and B in 12 days. If they work on it together then in how many days required to complete the work?
Choose the correct choice from the following answers
A) 83/19	B) 84/19	C) 81/19	D) 77/19	E) 87/19
Person ( A ) ( 84/19 ) ( A+84/19 )   Time - ( 7 ) ( 12 ) (84/19)   Rate - ( 12 ) ( 7 ) ( 19 )   Work - (84) ( 84 ) ( 84 )   therefore A+84/19 requires (84/19) days to complete entire work   = 84/19   Answer is 84/19
<result>B</result>
A can do a work in 7 days and B in 12 days. If they work on it together then in how many days required to complete the work?