Four children made the following statements.
Zoey : Joseph is 2 kg heavier than Isaac.
Isaac : Our masses are in consecutive order.
Christopher : The average of Zoey's mass and my mass is 44 kg.
Joseph : I am the heaviest.

What is the total mass of Christopher, Joseph and Zoey ?
Order of the mass of 4 children:
_____ , Isaac, _____ , Joseph (Heaviest)

Total mass of Christopher and Zoey
= 2 x 44
= 88 kg

For Christopher and Zoey,
Mass of the lighter one = 1 u
Mass of the heavier one = 1 u + 2

Total mass of Christopher and Zoey
= 1 u + 1 u + 2
= 2 u + 2

2 u + 2 = 88
2 u = 88 - 2
2 u = 86

1 u = 86 ÷ 2 = 43

The mass of the four children in consecutive order is 43, 44, 45 and 46.

Total mass of Christopher, Joseph and Zoey
= 43 + 45 + 46
= 134

Answer(s): 134 kg