Four children made the following statements.
Nathan : The average of Harris's mass and my mass is 46 kg.
Rael : I am the heaviest.
Harris : Evan is 2 kg lighter than Rael.
Evan : Our masses are in consecutive order.

What is the total mass of Nathan, Rael and Harris ?
Order of the mass of 4 children:
_____ , Evan, _____ , Rael (Heaviest)

Total mass of Nathan and Harris 
= 2 x 46
= 92 kg

For Nathan and Harris,
Mass of the lighter one = 1 u
Mass of the heavier one = 1 u + 2

Total mass of Nathan and Harris
= 1 u + 1 u + 2
= 2 u + 2

2 u + 2 = 92 
2 u = 92 - 2
2 u = 90

1 u = 90 ÷ 2 = 45

The mass of the four children in consecutive order is 45, 46, 47 and 48.

Total mass of Nathan, Rael and Harris
= 45 + 47 + 48
= 140

Answer(s): 140 kg