3 people who work full - time are to work together on a project , but their total time on the project is to be equivalent to that of only one person working full - time . if one of the people is budgeted for 1 / 2 of his time to the project and a second person for 1 / 3 of her time , what part of the third worker ' s time should be budgeted to this project ?  Choose the correct answer:
A) 1 / 3	B) 1 / 4	C) 1 / 6	D) 1 / 8	E) 1 / 9

Rationale: explanation : one - half ( 1 / 2 ) plus one - third ( 1 / 3 ) equals five - sixths ( 5 / 6 ) , so one - sixth ( 1 / 6 ) of the third worker ' s time should be budgeted to the project in order for the total time to be equivalent to that of one person working full - time . if x 2 - x - 6 = 0 , then ( x + 2 ) ( x - 3 ) = 0 , so x = - 2 or x = 3 . correct answer : a
Answer: A