The mass of 4 children, Min, Raeann, Caden and Vincent were taken. Only 3 children can be weighed at one time. Min, Raeann and Caden weighed a total of 48 kg. Raeann, Caden and Vincent weighed a total of 150 kg. Min, Caden and Vincent weighed a total of 79 kg. Min, Raeann, and Vincent weighed a total of 119 kg. What is the average mass of the 4 children?
Min + Raeann + Caden = 48 --- (1)
Raeann + Caden + Vincent = 150 --- (2)
Min + Caden + Vincent = 79 --- (3)
Min + Raeann + Vincent = 119 --- (4)

(1) + (2) + (3) + (4)
3(Min + Raeann + Caden + Vincent) = 48 + 150 + 79 + 119
3(Min + Raeann + Caden + Vincent) = 396
Min + Raeann + Caden + Vincent = 396 ÷ 3 = 132

Total mass of the 4 children = 132

Average mass of the 4 children
= 132 ÷ 4
= 33

Answer(s): 33 kg