Four children made the following statements.
Rebecca : The average of Evan's mass and my mass is 33 kg.
Jonathan : I am the heaviest.
Evan : Hannah is 2 kg lighter than Jonathan.
Hannah : Our masses are in consecutive order.

What is the total mass of Rebecca, Jonathan and Evan ?
Order of the mass of 4 children:
_____ , Hannah, _____ , Jonathan (Heaviest)

Total mass of Rebecca and Evan 
= 2 x 33
= 66 kg

For Rebecca and Evan,
Mass of the lighter one = 1 u
Mass of the heavier one = 1 u + 2

Total mass of Rebecca and Evan
= 1 u + 1 u + 2
= 2 u + 2

2 u + 2 = 66 
2 u = 66 - 2
2 u = 64

1 u = 64 ÷ 2 = 32

The mass of the four children in consecutive order is 32, 33, 34 and 35.

Total mass of Rebecca, Jonathan and Evan
= 32 + 34 + 35
= 101

Answer(s): 101 kg