An adult and a child each have a present. They get on a seesaw and place themselves and their presents in places that make the seesaw in equilibrium. The mass of the child is 41.41 kg and they sit 3.84 m to the left of the pivot after placing their present at 1.83 m left of the pivot. The 64.22 kg adult sits at 2.58 m to the right of the pivot after placing their 2.30 kg present at 0.93 m to the right of the pivot. What is the mas of the child's present?