An Adult and a Child Are on a Seesaw 14

An adult and a child are on a seesaw 14.5 ft long. The adult weighs 152 lb and the child weighs 80 lb. How many feet from the child must the fulcrum be placed so that the seesaw balances?
Use the lever system equation where d is the length of the lever and x is the distance of the fulcrum from the child.

A) 11.5 ft
B) 5.5 ft
C) 9.5 ft
D) 4.5 ft
E) 15 ft