Four children made the following statements.
Liam : The average of Victoria's mass and my mass is 30 kg.
Evan : I am the heaviest.
Victoria : John is 2 kg lighter than Evan.
John : Our masses are in consecutive order.

What is the total mass of Liam, Evan and Victoria ?
Order of the mass of 4 children:
_____ , John, _____ , Evan (Heaviest)

Total mass of Liam and Victoria 
= 2 x 30
= 60 kg

For Liam and Victoria,
Mass of the lighter one = 1 u
Mass of the heavier one = 1 u + 2

Total mass of Liam and Victoria
= 1 u + 1 u + 2
= 2 u + 2

2 u + 2 = 60 
2 u = 60 - 2
2 u = 58

1 u = 58 ÷ 2 = 29

The mass of the four children in consecutive order is 29, 30, 31 and 32.

Total mass of Liam, Evan and Victoria
= 29 + 31 + 32
= 92

Answer(s): 92 kg