Question
The mass of 4 children, Kimberly, Sabrina, Wesley and Eric were taken. Only 3 children can be weighed at one time. Kimberly, Sabrina and Wesley weighed a total of 87 kg. Sabrina, Wesley and Eric weighed a total of 88 kg. Kimberly, Wesley and Eric weighed a total of 68 kg. Kimberly, Sabrina, and Eric weighed a total of 117 kg. What is the average mass of the 4 children?
3 m

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The mass of 4 children, Kimberly, Sabrina, Wesley and Eric were taken. Only 3 children can be weighed at one time. Kimberly, Sabrina and Wesley weighed a total of 87 kg. Sabrina, Wesley and Eric weighed a total of 88 kg. Kimberly, Wesley and Eric weighed a total of 68 kg. Kimberly, Sabrina, and Eric weighed a total of 117 kg. What is the average mass of the 4 children?