Four children made the following statements.
Nora : The average of Natalie's mass and my mass is 41 kg.
Samuel : I am the heaviest.
Natalie : Anna is 2 kg lighter than Samuel.
Anna : Our masses are in consecutive order.

What is the total mass of Nora, Samuel and Natalie ?
Order of the mass of 4 children:
_____ , Anna, _____ , Samuel (Heaviest)

Total mass of Nora and Natalie 
= 2 x 41
= 82 kg

For Nora and Natalie,
Mass of the lighter one = 1 u
Mass of the heavier one = 1 u + 2

Total mass of Nora and Natalie
= 1 u + 1 u + 2
= 2 u + 2

2 u + 2 = 82 
2 u = 82 - 2
2 u = 80

1 u = 80 ÷ 2 = 40

The mass of the four children in consecutive order is 40, 41, 42 and 43.

Total mass of Nora, Samuel and Natalie
= 40 + 42 + 43
= 125

Answer(s): 125 kg